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x in (-oo:+oo)
75/80 = x/100 // - x/100
75/80-(x/100) = 0
15/16-1/100*x = 0 // - 15/16
-1/100*x = -15/16 // : -1/100
x = -15/16/(-1/100)
x = 375/4
x = 375/4
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