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x in (-oo:+oo)
100 = x+(20*x)/100 // - x+(20*x)/100
100-x-((20*x)/100) = 0
(-1/5)*x-x+100 = 0
100-6/5*x = 0 // - 100
-6/5*x = -100 // : -6/5
x = -100/(-6/5)
x = 250/3
x = 250/3
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