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k in (-oo:+oo)
(2*k)/(-7) = 18 // - 18
(2*k)/(-7)-18 = 0
-2/7*k-18 = 0 // + 18
-2/7*k = 18 // : -2/7
k = 18/(-2/7)
k = -63
k = -63
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