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X in (-oo:+oo)
X = (20/100)*X+20 // - (20/100)*X+20
X-((20/100)*X)-20 = 0
X+(-1/5)*X-20 = 0
4/5*X-20 = 0 // + 20
4/5*X = 20 // : 4/5
X = 20/4/5
X = 25
X = 25
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