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x in (-oo:+oo)
(1/(-3))*x = 17 // - 17
(1/(-3))*x-17 = 0
-1/3*x-17 = 0 // + 17
-1/3*x = 17 // : -1/3
x = 17/(-1/3)
x = -51
x = -51
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