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x in (-oo:+oo)
x-((20*x)/100) = 40 // - 40
x-((20*x)/100)-40 = 0
x+(-1/5)*x-40 = 0
4/5*x-40 = 0 // + 40
4/5*x = 40 // : 4/5
x = 40/4/5
x = 50
x = 50
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