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X in (-oo:+oo)
X/3-(1/2) = 9/12 // - 9/12
X/3-(1/2)-(9/12) = 0
X/3-1/2-3/4 = 0
1/3*X-5/4 = 0 // + 5/4
1/3*X = 5/4 // : 1/3
X = 5/4/1/3
X = 15/4
X = 15/4
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