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x in (-oo:+oo)
x-((10*x)/100) = 90 // - 90
x-((10*x)/100)-90 = 0
x+(-1/10)*x-90 = 0
9/10*x-90 = 0 // + 90
9/10*x = 90 // : 9/10
x = 90/9/10
x = 100
x = 100
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