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