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x in (-oo:+oo)
72/56 = x/100 // - x/100
72/56-(x/100) = 0
9/7-1/100*x = 0 // - 9/7
-1/100*x = -9/7 // : -1/100
x = -9/7/(-1/100)
x = 900/7
x = 900/7
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