tolong sama caranya ya

7.
9^(2x-1)/4 = 27^x+2
(3^2)(2x-1)/4 = (3^3)^x+2
3^(2x-1)/2 = 3^3x+6
(2x-1)/2 = 3x+6
2x-1 = 2(3x+6)
2x-1 = 6x+12
2x-6x = 12+1
-4x = 13
x = - 13/4
x = - 3 1/4

b.
25^x+4 = (1/125)^x
(5^2)^x+4 = (5^-3)^x
5^2x+8 = 5^-3x
2x+8 = -3x
2x+3x = -8
5x= - 8
x= - 8/5