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x in (-oo:+oo)
-(6*x)-6 = 66 // - 66
-(6*x)-66-6 = 0
-6*x-66-6 = 0
-6*x-72 = 0 // + 72
-6*x = 72 // : -6
x = 72/(-6)
x = -12
x = -12
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