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x in (-oo:+oo)
-12 = 2*x+4*x+6 // - 2*x+4*x+6
-(2*x)-(4*x)-12-6 = 0
-2*x-4*x-12-6 = 0
-6*x-18 = 0 // + 18
-6*x = 18 // : -6
x = 18/(-6)
x = -3
x = -3
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