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x in (-oo:+oo)
(1/(-6))*x = 3 // - 3
(1/(-6))*x-3 = 0
-1/6*x-3 = 0 // + 3
-1/6*x = 3 // : -1/6
x = 3/(-1/6)
x = -18
x = -18
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