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