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3x + 12 - 7x = -8
3x - 7x = -8 -12
-4x = -20
4x = 20
x = 5
Ditanya x + 2 =
5 + 2 = 7
Jadi jawabannya 7
12 + 8 = 7x - 3x
20 = 4x
x = 20/4
x = 5
maka, x + 2 = 5 + 2
= 7