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k in (-oo:+oo)
(k+10)/4 = k+1 // - k+1
(k+10)/4-k-1 = 0
(k+10)/4+(4*(-k))/4+(-1*4)/4 = 0
k+4*(-k)-1*4+10 = 0
10-3*k-4 = 0
6-3*k = 0
(6-3*k)/4 = 0
(6-3*k)/4 = 0 // * 4
6-3*k = 0
6-3*k = 0 // - 6
-3*k = -6 // : -3
k = -6/(-3)
k = 2
k = 2
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