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3x + 12 = 7x - 8
3x-7x = -8 -12
-4x = -20
x= -20/-4
x= 5
jadi X + 2
5 + 2 = 7
3x - 7x = - 8 - 12
- 4x = - 20
x = 5
x + 2 = 5 + 2 = 7