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x in (-oo:+oo)
x+(5/100)*x = 100 // - 100
x+(5/100)*x-100 = 0
21/20*x-100 = 0 // + 100
21/20*x = 100 // : 21/20
x = 100/21/20
x = 2000/21
x = 2000/21
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