Answer 1

$\displaystyle 9^{x+4}=0,12*5^{2x+9} \\ 3^{2x}*3^{8}=0,12*5^{9}* 5^{2x} \\ 3^{2x}*3^{8}=0,12*25*5^{7}*5^{2x}\\3^{2x}*3^{8}=3*5^{7}*5^{2x}\\3^{2x}*3^{7}=5^{7}*5^{2x} \\3^{2x+7}=5^{2x+7} \\ \\ 2x+7=0 \\2x=-7 \\x=-3,5$

Ответ: {-3,5}

Answer 2

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