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x in (-oo:+oo)
9/12 = x/100 // - x/100
9/12-(x/100) = 0
3/4-1/100*x = 0 // - 3/4
-1/100*x = -3/4 // : -1/100
x = -3/4/(-1/100)
x = 75
x = 75
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