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X in (-oo:+oo)
X/5-(1/2) = 4 // - 4
X/5-(1/2)-4 = 0
X/5-1/2-4 = 0
1/5*X-9/2 = 0 // + 9/2
1/5*X = 9/2 // : 1/5
X = 9/2/1/5
X = 45/2
X = 45/2
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