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k in (-oo:+oo)
(1/5)*k-k-(1/3) = (1/15)*(k+3) // - (1/15)*(k+3)
(1/5)*k-((1/15)*(k+3))-k-(1/3) = 0
(-1/15)*(k+3)+(1/5)*k-k-1/3 = 0
k/5-1/15*(k+3)-k-1/3 = 0
(-1/15*3*5*(k+3))/(3*5)+(3*k)/(3*5)+(3*5*(-k))/(3*5)+(-1*5)/(3*5) = 0
3*k-1/15*3*5*(k+3)+3*5*(-k)-1*5 = 0
2*k-15*k-5-3 = 0
-13*k-5-3 = 0
-13*k-8 = 0
(-13*k-8)/(3*5) = 0
(-13*k-8)/(3*5) = 0 // * 3*5
-13*k-8 = 0
-13*k-8 = 0 // + 8
-13*k = 8 // : -13
k = 8/(-13)
k = -8/13
k = -8/13
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