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X in (-oo:+oo)
X/40 = 7/56 // - 7/56
X/40-(7/56) = 0
X/40-1/8 = 0
1/40*X-1/8 = 0 // + 1/8
1/40*X = 1/8 // : 1/40
X = 1/8/1/40
X = 5
X = 5
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