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-14 = 2x
x = -7
x+12
-7 + 12 = 5
3x - 5x = 20 - 6
- 2x = 14
x = 14 / - 2
x = - 7
jadi x = - 7
x + 12 = - 7 + 12
= 5
semoga benar dan jika salah mohon maaf.