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k in (-oo:+oo)
(3/7)*k+3*k-4 = -44/7 // + -44/7
(3/7)*k+3*k-(-44/7)-4 = 0
(3/7)*k+3*k+44/7-4 = 0
24/7*k+16/7 = 0 // - 16/7
24/7*k = -16/7 // : 24/7
k = -16/7/24/7
k = -2/3
k = -2/3
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