2^x=9
x=log(2)9
12^x=7
x=log(12)7
(1/3)^x=4
x=log(1/3)4
0,2^x=6
x=log(0,2)6
3^(x+1)=14
x+1=log(3)14
x=log(3)14-1
4^(5x-4)=10
5x-4=log(4)10
5x=4+log(4)10
x=0,8+0,2log(4)10
(2/7)^(3-x)=11
3-x=log(2/3)11
x=3-log(2/3)11
(√5)^(8-9x)=6
1/2*(8x-9)=log(5)6
4x=4,5+log(5)6
x=9/16+1/4*log(5)6