Срочно 3^(2x)+3^(2x+1)=2*7^(2x)-5*7^(2x-1)
3^(2x)+3^(2x+1)=2*7^(2x)-5*7^(2x-1)
3^(2x-1)*(3+3^2)=7^(2x-1)*(2*7-5)
12*3^(2x-1) = 9 * 7^(2x-1)
(3/7)^(2x-1) = 9/12 = 3/4
(2x-1) log(3/4) 3/7 = 1
2x* log(3/4) 3/7 = 1 + log(3/4) 3/7
x = (1 + log(3/4) 3/7) / 2log(3/4) 3/7