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x in (-oo:+oo)
x-(1/2) = 1-(3*x)-(12/3) // - 1-(3*x)-(12/3)
x+3*x-(1/2)+12/3-1 = 0
x+3*x-1/2+12/3-1 = 0
4*x+5/2 = 0 // - 5/2
4*x = -5/2 // : 4
x = -5/2/4
x = -5/8
x = -5/8
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