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k in (-oo:+oo)
8 = (7*k-4)/3 // - (7*k-4)/3
8-((7*k-4)/3) = 0
(-1*(7*k-4))/3+8 = 0
(-1*(7*k-4))/3+(3*8)/3 = 0
3*8-1*(7*k-4) = 0
28-7*k = 0
(28-7*k)/3 = 0
(28-7*k)/3 = 0 // * 3
28-7*k = 0
28-7*k = 0 // - 28
-7*k = -28 // : -7
k = -28/(-7)
k = 4
k = 4
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