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k in (-oo:+oo)
2/3-k-(1/2) = (1/6)*(k-51) // - (1/6)*(k-51)
2/3-((1/6)*(k-51))-k-(1/2) = 0
(-1/6)*(k-51)-k+2/3-1/2 = 0
2/3-1/6*(k-51)-k-1/2 = 0
(-1/6*2*3*(k-51))/(2*3)+(2*3*(-k))/(2*3)+(2^2)/(2*3)+(-1*3)/(2*3) = 0
2*3*(-k)-1/6*2*3*(k-51)-1*3+4 = 0
4-7*k-3+51 = 0
55-7*k-3 = 0
52-7*k = 0
(52-7*k)/(2*3) = 0
(52-7*k)/(2*3) = 0 // * 2*3
52-7*k = 0
52-7*k = 0 // - 52
-7*k = -52 // : -7
k = -52/(-7)
k = 52/7
k = 52/7
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