Найдите корень уравнения ( 1 5 ) − 3 𝑥 + 2 : ( 1 5 ) 7 𝑥 − 4 = 1 25 ${\displaystyle {\left(\frac{1}{5}\right)}^{-3x+2}:{\left(\frac{1}{5}\right)}^{7x-4}=\frac{1}{25}}$