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X in (-oo:+oo)
X/2-9 = 3/4 // - 3/4
X/2-(3/4)-9 = 0
X/2-3/4-9 = 0
1/2*X-39/4 = 0 // + 39/4
1/2*X = 39/4 // : 1/2
X = 39/4/1/2
X = 39/2
X = 39/2
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