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x in (-oo:+oo)
x/100 = 70/80 // - 70/80
x/100-(70/80) = 0
x/100-7/8 = 0
1/100*x-7/8 = 0 // + 7/8
1/100*x = 7/8 // : 1/100
x = 7/8/1/100
x = 175/2
x = 175/2
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