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k in (-oo:+oo)
(3/5)*k-k-(1/3) = (1/15)*(k+1) // - (1/15)*(k+1)
(3/5)*k-((1/15)*(k+1))-k-(1/3) = 0
(-1/15)*(k+1)+(3/5)*k-k-1/3 = 0
(3*k)/5-1/15*(k+1)-k-1/3 = 0
(-1/15*3*5*(k+1))/(3*5)+(3*3*k)/(3*5)+(3*5*(-k))/(3*5)+(-1*5)/(3*5) = 0
3*3*k-1/15*3*5*(k+1)+3*5*(-k)-1*5 = 0
8*k-15*k-5-1 = 0
-7*k-5-1 = 0
-7*k-6 = 0
(-7*k-6)/(3*5) = 0
(-7*k-6)/(3*5) = 0 // * 3*5
-7*k-6 = 0
-7*k-6 = 0 // + 6
-7*k = 6 // : -7
k = 6/(-7)
k = -6/7
k = -6/7
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