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