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x in (-oo:+oo)
x-((20*x)/100) = 0.04 // - 0.04
x-((20*x)/100)-0.04 = 0
x+(-1/5)*x-0.04 = 0
4/5*x-0.04 = 0 // + 0.04
4/5*x = 0.04 // : 4/5
x = 0.04/4/5
x = 0.05
x = 0.05
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