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3x - 5x = 20 - 6
- 2x = 14
x = - 14 / 2
= - 7
jadi x + 12 = -7 + 12 = 5
3x - 5 = 20 - 6 - 2x = 14
x = -7
maka nilai x + 12 = -7 + 12 = 5