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k in (-oo:+oo)
(3/7)*k+k-9 = -61/7 // + -61/7
(3/7)*k+k-(-61/7)-9 = 0
(3/7)*k+k+61/7-9 = 0
10/7*k-2/7 = 0 // + 2/7
10/7*k = 2/7 // : 10/7
k = 2/7/10/7
k = 1/5
k = 1/5
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