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X in (-oo:+oo)
9-((1/2)*X) = 13 // - 13
9-((1/2)*X)-13 = 0
(-1/2)*X-13+9 = 0
-1/2*X-4 = 0 // + 4
-1/2*X = 4 // : -1/2
X = 4/(-1/2)
X = -8
X = -8
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