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x in (-oo:+oo)
2*(5*x+6) = -68 // + 68
2*(5*x+6)+68 = 0
2*(5*x+6)+68 = 0
10*x+80 = 0
10*x+80 = 0
10*x+80 = 0 // - 80
10*x = -80 // : 10
x = -80/10
x = -8
x = -8
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