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X in (-oo:+oo)
(1/2)*X-3 = 3/4 // - 3/4
(1/2)*X-(3/4)-3 = 0
(1/2)*X-3/4-3 = 0
1/2*X-15/4 = 0 // + 15/4
1/2*X = 15/4 // : 1/2
X = 15/4/1/2
X = 15/2
X = 15/2
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