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x in (-oo:+oo)
X-(2*(X-1)) = x/2+4 // - x/2+4
X-(2*(X-1))-(x/2)-4 = 0
X-2*(X-1)-(x/2)-4 = 0
X-2*(X-1)-x/2-4 = 0
(-2*2*(X-1))/2+(2*X)/2-x/2+(-4*2)/2 = 0
2*X-2*2*(X-1)-x-4*2 = 0
4-2*X-x-8 = 0
-2*X-x-4 = 0
(-2*X-x-4)/2 = 0
(-2*X-x-4)/2 = 0 // * 2
-2*X-x-4 = 0
-2*X-x-4 = 0 // + -2*X-4
-x = -(-2*X-4) // * -1
x = -2*X-4
x = -2*X-4
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