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x in (-oo:+oo)
-(3*x)-6 = 12 // - 12
-(3*x)-12-6 = 0
-3*x-12-6 = 0
-3*x-18 = 0 // + 18
-3*x = 18 // : -3
x = 18/(-3)
x = -6
x = -6
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