Question

5^3x-1 * 25^7-5x = 0.2^- степень

Answer 1

$5^{3x-1}* 5^{14-10x} = 5^{-1}$
$5^{13-7x} = 5^{-1}$
13-7x=-1
7x=14
x=2

Answer 2

5^3х-1 * 25^7-5х = 0.2;

5^3х-1 * 5^14-10х = 5^-1;

5^-7х+13 = 5^-1;

-7х+13 = -1;

-7х=-1-13; |(-1);

7х=14;

х=2;