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x in (-oo:+oo)
4*(5*x-2) = -108 // + 108
4*(5*x-2)+108 = 0
4*(5*x-2)+108 = 0
20*x+100 = 0
20*x+100 = 0
20*x+100 = 0 // - 100
20*x = -100 // : 20
x = -100/20
x = -5
x = -5
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