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x in (-oo:+oo)
-130 = 6*x+6*x+2 // - 6*x+6*x+2
-(6*x)-(6*x)-130-2 = 0
-6*x-6*x-130-2 = 0
-12*x-132 = 0 // + 132
-12*x = 132 // : -12
x = 132/(-12)
x = -11
x = -11
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