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x in (-oo:+oo)
2*x-(1/2) = 3 // - 3
2*x-(1/2)-3 = 0
2*x-1/2-3 = 0
2*x-7/2 = 0 // + 7/2
2*x = 7/2 // : 2
x = 7/2/2
x = 7/4
x = 7/4
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