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k in (-oo:+oo)
(2/3)*k-((1/14)*k) = -3 // + 3
(2/3)*k-((1/14)*k)+3 = 0
(2/3)*k+(-1/14)*k+3 = 0
25/42*k+3 = 0 // - 3
25/42*k = -3 // : 25/42
k = -3/25/42
k = -126/25
k = -126/25
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