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