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x in (-oo:+oo)
x-((x-1)/2) = 1-x-3+2 // - 1-x-3+2
x-((x-1)/2)+x-2-1+3 = 0
(-1*(x-1))/2+x+x-2-1+3 = 0
(-1*(x-1))/2+(2*x)/2+(2*x)/2+(-2*2)/2+(-1*2)/2+(2*3)/2 = 0
2*x-1*(x-1)+2*x-2*2-1*2+2*3 = 0
x+2*x-4-2+1+6 = 0
3*x-4-2+1+6 = 0
3*x-3-2+6 = 0
3*x-5+6 = 0
3*x+1 = 0
(3*x+1)/2 = 0
(3*x+1)/2 = 0 // * 2
3*x+1 = 0
3*x+1 = 0 // - 1
3*x = -1 // : 3
x = -1/3
x = -1/3
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