Question

7^x-7^x-1=6

помоооогитее

Answer 1

$7^{x}-7^{x-1}=6$

$7^{x}-7^{x}*frac{1}{7}=6$

$7^{x}(1-frac{1}{7})=6$

$7^{x}*frac{6}{7}=6$

$7^{x}=6*frac{7}{6}$

$7^{x}=7^{1}$

$x=1$