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K in (-oo:+oo)
(1/5)*K-((1/15)*(K+1))-K-(1/3) = 0
(-1/15)*(K+1)+(1/5)*K-K-1/3 = 0
K/5-1/15*(K+1)-K-1/3 = 0
(-1/15*3*5*(K+1))/(3*5)+(3*K)/(3*5)+(3*5*(-K))/(3*5)+(-1*5)/(3*5) = 0
3*K-1/15*3*5*(K+1)+3*5*(-K)-1*5 = 0
2*K-15*K-5-1 = 0
-13*K-5-1 = 0
-13*K-6 = 0
(-13*K-6)/(3*5) = 0
(-13*K-6)/(3*5) = 0 // * 3*5
-13*K-6 = 0
-13*K-6 = 0 // + 6
-13*K = 6 // : -13
K = 6/(-13)
K = -6/13
K = -6/13
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