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x in (-oo:+oo)
3*x-(1/2) = x-3 // - x-3
3*x-x-(1/2)+3 = 0
3*x-x-1/2+3 = 0
2*x+5/2 = 0 // - 5/2
2*x = -5/2 // : 2
x = -5/2/2
x = -5/4
x = -5/4
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