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6x-12=12x+20
6x-12x=20+12
-6x=32
x=-5,3
6x-12 = 12x+20
6x-12x = 20+12
-6x = 32
x = 32/-6 = -5,3
atau
x = 32/-6 = 16/-3
Jadi, X = (-5,3) atau 16/-3