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X in (-oo:+oo)
X/2 = -13/2 // + -13/2
X/2-(-13/2) = 0
X/2+13/2 = 0
1/2*X+13/2 = 0 // - 13/2
1/2*X = -13/2 // : 1/2
X = -13/2/1/2
X = -13
X = -13
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