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X in (-oo:+oo)
X/40 = 5/2 // - 5/2
X/40-(5/2) = 0
X/40-5/2 = 0
1/40*X-5/2 = 0 // + 5/2
1/40*X = 5/2 // : 1/40
X = 5/2/1/40
X = 100
X = 100
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