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