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X in (-oo:+oo)
X/30 = 2/12 // - 2/12
X/30-(2/12) = 0
X/30-1/6 = 0
1/30*X-1/6 = 0 // + 1/6
1/30*X = 1/6 // : 1/30
X = 1/6/1/30
X = 5
X = 5
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