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k in (-oo:+oo)
(2/7)*k-(1/14) = -3 // + 3
(2/7)*k-(1/14)+3 = 0
(2/7)*k-1/14+3 = 0
2/7*k+41/14 = 0 // - 41/14
2/7*k = -41/14 // : 2/7
k = -41/14/2/7
k = -41/4
k = -41/4
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