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