3*(2/3)^2x+2*(3/2)^2x=5
(2/3)^2x=t, то (3/2)^2x=1/t
3t+2/t-5=0
3t^2-5t+2=0
D=1 t1=1, t2=2/3(2/3)^2x=1 или (2/3)^2x=2/3
2x=0 2x=1
x=0 x=1/2
3*2^4x+2*3^4x=5*2^2x*3^2x
3*(2/3)^2x+2*(3/2)^2x=5
(2/3)^2x=t, то (3/2)^2x=1/t
3t+2/t-5=0
3t^2-5t+2=0
D=1
t1=1, t2=2/3
(2/3)^2x=1 или (2/3)^2x=2/3
2x=0 2x=1
x=0 x=1/2