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x in (-oo:+oo)
2*(x-3) = 1/2-1 // - 1/2-1
2*(x-3)-(1/2)+1 = 0
2*(x-3)-1/2+1 = 0
(2^2*(x-3))/2-1/2+(1*2)/2 = 0
2^2*(x-3)+1*2-1 = 0
4*x-13+2 = 0
4*x-11 = 0
(4*x-11)/2 = 0
(4*x-11)/2 = 0 // * 2
4*x-11 = 0
4*x-11 = 0 // + 11
4*x = 11 // : 4
x = 11/4
x = 11/4
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