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x in (-oo:+oo)
x/100 = 80/100 // - 80/100
x/100-(80/100) = 0
x/100-4/5 = 0
1/100*x-4/5 = 0 // + 4/5
1/100*x = 4/5 // : 1/100
x = 4/5/1/100
x = 80
x = 80
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