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