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4^[(x -1)/(x + 1)] = 4^0
(x -1) / (x + 1) = 0
x - 1 = 0
x = 1
====
3^(3x) * 5^( x -2) = ( 3^2)^( x + 1)
3^(3x) * 5^( x - 2) = 3^(2x + 2) / : 3^( 2x + 2)
3^(x - 2) * 5^(x -2) = 1
( 3*5)^( x - 2) = 1
15^( x - 2) = 15^0
x - 2 = 0
x = 2
=====
12^(2x + 4) = 3^(3x) *4^(x + 8)
3^(2x + 4)* 4^(2x + 4) = 3^(3x) * 4^( x + 8) / : 3^(3x)
3^( - x + 4)* 4^(2x + 4) = 4^( x + 8) / : 4^(2x + 4)
3^( - x + 4) = 4^(- x + 4)
- x + 4 = 0
x = 4
=====