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x in (-oo:+oo)
x/2-(2*(1-x)) = 3 // - 3
x/2-(2*(1-x))-3 = 0
x/2-2*(1-x)-3 = 0
(-2*2*(1-x))/2+x/2+(-3*2)/2 = 0
x-2*2*(1-x)-3*2 = 0
5*x-6-4 = 0
5*x-10 = 0
(5*x-10)/2 = 0
(5*x-10)/2 = 0 // * 2
5*x-10 = 0
5*x-10 = 0 // + 10
5*x = 10 // : 5
x = 10/5
x = 2
x = 2
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