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x in (-oo:+oo)
-60 = 2*x+4*x+6 // - 2*x+4*x+6
-(2*x)-(4*x)-60-6 = 0
-2*x-4*x-60-6 = 0
-6*x-66 = 0 // + 66
-6*x = 66 // : -6
x = 66/(-6)
x = -11
x = -11
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