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X in (-oo:+oo)
9/30 = X/100 // - X/100
9/30-(X/100) = 0
3/10-1/100*X = 0 // - 3/10
-1/100*X = -3/10 // : -1/100
X = -3/10/(-1/100)
X = 30
X = 30
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