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X in (-oo:+oo)
X/4 = 15/3 // - 15/3
X/4-(15/3) = 0
X/4-5 = 0
1/4*X-5 = 0 // + 5
1/4*X = 5 // : 1/4
X = 5/1/4
X = 20
X = 20
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