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k in (-oo:+oo)
(2/3)*k-k-(1/4) = (1/2)*(k+4) // - (1/2)*(k+4)
(2/3)*k-((1/2)*(k+4))-k-(1/4) = 0
(-1/2)*(k+4)+(2/3)*k-k-1/4 = 0
(2*k)/3-1/2*(k+4)-k-1/4 = 0
(-1/2*3*4*(k+4))/(3*4)+(2*4*k)/(3*4)+(3*4*(-k))/(3*4)+(-1*3)/(3*4) = 0
2*4*k-1/2*3*4*(k+4)+3*4*(-k)-1*3 = 0
2*k-12*k-24-3 = 0
-10*k-24-3 = 0
-10*k-27 = 0
(-10*k-27)/(3*4) = 0
(-10*k-27)/(3*4) = 0 // * 3*4
-10*k-27 = 0
-10*k-27 = 0 // + 27
-10*k = 27 // : -10
k = 27/(-10)
k = -27/10
k = -27/10
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