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x in (-oo:+oo)
(3*x-1)/2+(x+1)/2 = 3 // - 3
(3*x-1)/2+(x+1)/2-3 = 0
(3*x-1)/2+(x+1)/2+(-3*2)/2 = 0
3*x+x-3*2-1+1 = 0
4*x-6 = 0
(4*x-6)/2 = 0
(4*x-6)/2 = 0 // * 2
4*x-6 = 0
4*x-6 = 0 // + 6
4*x = 6 // : 4
x = 6/4
x = 3/2
x = 3/2
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