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x in (-oo:+oo)
4*(x+10) = 80 // - 80
4*(x+10)-80 = 0
4*(x+10)-80 = 0
4*x-40 = 0
4*x-40 = 0
4*x-40 = 0 // + 40
4*x = 40 // : 4
x = 40/4
x = 10
x = 10
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