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x in (-oo:+oo)
-(2*x)-6 = x+6 // - x+6
-(2*x)-x-6-6 = 0
-2*x-x-6-6 = 0
-3*x-12 = 0 // + 12
-3*x = 12 // : -3
x = 12/(-3)
x = -4
x = -4
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