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x in (-oo:+oo)
x/100 = 40/200 // - 40/200
x/100-(40/200) = 0
x/100-1/5 = 0
1/100*x-1/5 = 0 // + 1/5
1/100*x = 1/5 // : 1/100
x = 1/5/1/100
x = 20
x = 20
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