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