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k in (-oo:+oo)
(2/7)*k-(1/4) = -3 // + 3
(2/7)*k-(1/4)+3 = 0
(2/7)*k-1/4+3 = 0
2/7*k+11/4 = 0 // - 11/4
2/7*k = -11/4 // : 2/7
k = -11/4/2/7
k = -77/8
k = -77/8
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