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X in (-oo:+oo)
X/30 = 14/15 // - 14/15
X/30-(14/15) = 0
X/30-14/15 = 0
1/30*X-14/15 = 0 // + 14/15
1/30*X = 14/15 // : 1/30
X = 14/15/1/30
X = 28
X = 28
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