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x in (-oo:+oo)
70 = 2*x+4*x-2 // - 2*x+4*x-2
2-(2*x)-(4*x)+70 = 0
2-2*x-4*x+70 = 0
72-6*x = 0 // - 72
-6*x = -72 // : -6
x = -72/(-6)
x = 12
x = 12
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