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k in (-oo:+oo)
(1/5)*k-k-(1/3) = (1/15)*(k+5) // - (1/15)*(k+5)
(1/5)*k-((1/15)*(k+5))-k-(1/3) = 0
(-1/15)*(k+5)+(1/5)*k-k-1/3 = 0
k/5-1/15*(k+5)-k-1/3 = 0
(-1/15*3*5*(k+5))/(3*5)+(3*k)/(3*5)+(3*5*(-k))/(3*5)+(-1*5)/(3*5) = 0
3*k-1/15*3*5*(k+5)+3*5*(-k)-1*5 = 0
2*k-15*k-5-5 = 0
-13*k-5-5 = 0
-13*k-10 = 0
(-13*k-10)/(3*5) = 0
(-13*k-10)/(3*5) = 0 // * 3*5
-13*k-10 = 0
-13*k-10 = 0 // + 10
-13*k = 10 // : -13
k = 10/(-13)
k = -10/13
k = -10/13
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