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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
4x = 20
x = 5
Maka nilai x + 2 = 5 + 2
= 7
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