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x in (-oo:+oo)
5*(4*x+8) = -140 // + 140
5*(4*x+8)+140 = 0
5*(4*x+8)+140 = 0
20*x+180 = 0
20*x+180 = 0
20*x+180 = 0 // - 180
20*x = -180 // : 20
x = -180/20
x = -9
x = -9
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