✔ 最佳答案
3^(x+2)=5^2x
ln3^(x+2)=ln5^(2x)
(x+2)ln(3)=2xln(5)
3(x+2)=10x
3x+6=10x
3x-10x=-6
-7x=-6
x=6/7 answer//
another solution
(x+2)ln3=2xln5
xln3+2ln3=2xln5
xln3-2xln5=-2ln3
x(ln3-2ln5=-2ln3
......-2ln3..........-2ln3........
x=------------ =.. -------------
...(ln3-2ln5).....(ln3-ln5^2)
......-2ln(3)
x=-------------- answer//
....ln(3)-ln(25)