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x in (-oo:+oo)
x/100 = 0.2 // - 0.2
x/100-0.2 = 0
1/100*x-0.2 = 0 // + 0.2
1/100*x = 0.2 // : 1/100
x = 0.2/1/100
x = 20
x = 20
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