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3x - 7x = -8 - 12
-4x = -20
x = -20/-4
x = 5
jd hp , x=5
Dit : HP = ....
Jwb : 3x + 12 = 7x - 8
3x - 7x = -8-12
-4x = -20
x = -20 ÷ -4
= 5
Jadi, himpunan penyelesaiannya adalah 5