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X in (-oo:+oo)
X/40 = 6/15 // - 6/15
X/40-(6/15) = 0
X/40-2/5 = 0
1/40*X-2/5 = 0 // + 2/5
1/40*X = 2/5 // : 1/40
X = 2/5/1/40
X = 16
X = 16
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