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k in (-oo:+oo)
(4/5)*k-k-(1/3) = (1/5)*(k+1) // - (1/5)*(k+1)
(4/5)*k-((1/5)*(k+1))-k-(1/3) = 0
(-1/5)*(k+1)+(4/5)*k-k-1/3 = 0
(4*k)/5-1/5*(k+1)-k-1/3 = 0
(-1/5*3*5*(k+1))/(3*5)+(3*4*k)/(3*5)+(3*5*(-k))/(3*5)+(-1*5)/(3*5) = 0
3*4*k-1/5*3*5*(k+1)+3*5*(-k)-1*5 = 0
9*k-15*k-5-3 = 0
-6*k-5-3 = 0
-6*k-8 = 0
(-6*k-8)/(3*5) = 0
(-6*k-8)/(3*5) = 0 // * 3*5
-6*k-8 = 0
-6*k-8 = 0 // + 8
-6*k = 8 // : -6
k = 8/(-6)
k = -4/3
k = -4/3
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