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x in (-oo:+oo)
x/20 = 10/100 // - 10/100
x/20-(10/100) = 0
x/20-1/10 = 0
1/20*x-1/10 = 0 // + 1/10
1/20*x = 1/10 // : 1/20
x = 1/10/1/20
x = 2
x = 2
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