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x in (-oo:+oo)
x-(20*(x/100)) = 100 // - 100
x-(20*(x/100))-100 = 0
x+(-1/5)*x-100 = 0
4/5*x-100 = 0 // + 100
4/5*x = 100 // : 4/5
x = 100/4/5
x = 125
x = 125
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