номер 91 гдз 8 класс алгебра Муравин Муравин

1)\begin{equation}a^{2}-\frac{bc}{15} \end{equation} \begin{equation}a^{2}-\frac{bc}{15}=\frac{15a^{2}-bc}{15} \end{equation} 2)\begin{equation}bc-\frac{c^{2}}{18} \end{equation} \begin{equation}bc-\frac{c^{2}}{18}=\frac{18bc-c^{2}}{18} \end{equation} 3)\begin{equation}x-\frac{3x-1}{7} \end{equation} \begin{equation}x-\frac{3x-1}{7}=\frac{7x-3x+1}{7}=\frac{4x+1}{7} \end{equation} 4)\begin{equation}\frac{7y-5}{9}-x \end{equation} \begin{equation}\frac{7y-5}{9}-x=\frac{7y-5-9x}{9} \end{equation} 5)\begin{equation}\frac{2x-5}{3}-\frac{3x-7}{4}+x \end{equation} \begin{equation}\frac{8x-20-9x+21+12x}{12}=\frac{11x+1}{12} \end{equation} 6)\begin{equation}2y-\frac{4y-7}{8}-\frac{5y+9}{4} \end{equation} \begin{equation}\frac{16y-4y+7-10y-18}{8}=\frac{2y-11}{8} \end{equation} 7)\begin{equation}\frac{5a-6}{8}-\frac{7a-8}{12}+a-1 \end{equation} \begin{equation}\frac{15a-18-14a+16+24a-24}{24}= \end{equation} \begin{equation}=\frac{25a-26}{24} \end{equation} 8)\begin{equation}3b-2-\frac{7b-9}{10}-\frac{9b-7}{15} \end{equation} \begin{equation}\frac{90b-60-21b+27-18b+14}{30}= \end{equation} \begin{equation}=\frac{51b-19}{50} \end{equation} 9)\begin{equation}x-y-\frac{2x-3y}{14}+\frac{3x-2y}{21} \end{equation} \begin{equation}\frac{42x-42y-6x+9y+6x-4y}{42}= \end{equation} \begin{equation}=\frac{42x-37y}{42} \end{equation} 10)\begin{equation}\frac{4a-2b}{9}+\frac{9b+7a}{24}-a+b \end{equation} \begin{equation}\frac{32a-16b+27b+21a-72a+72b}{72}= \end{equation} \begin{equation}=\frac{83b-19a}{72} \end{equation} 11)\begin{equation}a-\frac{7a-4b}{12}-\frac{4a+7b}{18}+2b \end{equation} \begin{equation}\frac{36a-21a+12b-8a-14b+72b}{36}= \end{equation} \begin{equation}=\frac{7a+70b}{36} \end{equation} 12)\begin{equation}\frac{8x-9y}{33}+\frac{8y-9x}{22}-x-y \end{equation} \begin{equation}\frac{16x-18y+24y-27x-66x-66y}{66}= \end{equation} \begin{equation}=\frac{-77x-60y}{66}=-\frac{77x+60y}{66} \end{equation} \begin{equation} \end{equation} \begin{equation} \end{equation} \begin{equation} \end{equation}
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