Question

(3^х+3)+3^х=(7^х+1)+5*7^х

Answer 1

$27*3^{x}+3^x=7*7^{x}+5*7^x \ \textless \ =\ \textgreater \ 28*3^x=12*7^x \ \textless \ =\ \textgreater \ (\frac{3}{7})^x=\frac{3}{7}$
Отсюда x=1