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12-4x=18-6x
-4x+6x=18-12
2x=6
x=3
---> kedua ruas dikali 6
2.(6 - 2x) = - 6x + 15
12 - 4x = -6x + 15
12 - 4x + 6x = 15
2x = 15 - 12
x =