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X in (-oo:+oo)
X/2-(18/1) = -28 // + 28
X/2-(18/1)+28 = 0
X/2-18+28 = 0
1/2*X+10 = 0 // - 10
1/2*X = -10 // : 1/2
X = -10/1/2
X = -20
X = -20
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