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k in (-oo:+oo)
(1/3)*k-k-(1/4) = (1/12)*(k+4) // - (1/12)*(k+4)
(1/3)*k-((1/12)*(k+4))-k-(1/4) = 0
(-1/12)*(k+4)+(1/3)*k-k-1/4 = 0
k/3-1/12*(k+4)-k-1/4 = 0
(-1/12*3*4*(k+4))/(3*4)+(4*k)/(3*4)+(3*4*(-k))/(3*4)+(-1*3)/(3*4) = 0
4*k-1/12*3*4*(k+4)+3*4*(-k)-1*3 = 0
3*k-12*k-4-3 = 0
-9*k-4-3 = 0
-9*k-7 = 0
(-9*k-7)/(3*4) = 0
(-9*k-7)/(3*4) = 0 // * 3*4
-9*k-7 = 0
-9*k-7 = 0 // + 7
-9*k = 7 // : -9
k = 7/(-9)
k = -7/9
k = -7/9
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