Question

Найдите корень уравнения 3^x-7=1/27

Answer 1

$3^{x-7} = \frac{1}{27} \\ \\ 3^{x-7} = \frac{1}{3^3} \\ \\ 3^{x-7} = 3^{-3} \\\\ x-7=-3 \\ x=4$