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