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X in (-oo:+oo)
X/5-1.5 = 4 // - 4
X/5-4-1.5 = 0
1/5*X-5.5 = 0 // + 5.5
1/5*X = 5.5 // : 1/5
X = 5.5/1/5
X = 27.5
X = 27.5
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