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x in (-oo:+oo)
-(6*x)-6 = 18 // - 18
-(6*x)-18-6 = 0
-6*x-18-6 = 0
-6*x-24 = 0 // + 24
-6*x = 24 // : -6
x = 24/(-6)
x = -4
x = -4
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