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k in (-oo:+oo)
(2/3)*k-k-(1/4) = (1/12)*(k+4) // - (1/12)*(k+4)
(2/3)*k-((1/12)*(k+4))-k-(1/4) = 0
(-1/12)*(k+4)+(2/3)*k-k-1/4 = 0
(2*k)/3-1/12*(k+4)-k-1/4 = 0
(-1/12*3*4*(k+4))/(3*4)+(2*4*k)/(3*4)+(3*4*(-k))/(3*4)+(-1*3)/(3*4) = 0
2*4*k-1/12*3*4*(k+4)+3*4*(-k)-1*3 = 0
7*k-12*k-4-3 = 0
-5*k-4-3 = 0
-5*k-7 = 0
(-5*k-7)/(3*4) = 0
(-5*k-7)/(3*4) = 0 // * 3*4
-5*k-7 = 0
-5*k-7 = 0 // + 7
-5*k = 7 // : -5
k = 7/(-5)
k = -7/5
k = -7/5
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