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x in (-oo:+oo)
x-((20*x)/100) = 119.59 // - 119.59
x-((20*x)/100)-119.59 = 0
x+(-1/5)*x-119.59 = 0
4/5*x-119.59 = 0 // + 119.59
4/5*x = 119.59 // : 4/5
x = 119.59/4/5
x = 149.4875
x = 149.4875
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