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