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12^-x+7 = 12^2x+1
-x + 7 = 2x + 1
7 - 1 = 2x + x
6 = 3x
x = 6/3
x = 2
2. 9^3x+2 = 1/81^2x-5
9^3x+2 = 9^-2(2x-5)
3x + 2 = -2(2x - 5)
3x + 2 = -4x + 10
3x + 4x = 10 - 2
7x = 8
x = 8/7
Ket : tanda " ^ " adalah pangkat
karna udah sama sama 12., pangkatnya disamaain aja.
-x+7 = 2x+1
-3x = -6
x = 2
2.
6x+4 = -8x+20
14x = 16
x = 8/7