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X in (-oo:+oo)
X/4-(2/5) = 7/20 // - 7/20
X/4-(2/5)-(7/20) = 0
X/4-2/5-7/20 = 0
1/4*X-3/4 = 0 // + 3/4
1/4*X = 3/4 // : 1/4
X = 3/4/1/4
X = 3
X = 3
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