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k in (-oo:+oo)
(3/5)*(k+1) = (1/4)*(2*k+3) // - (1/4)*(2*k+3)
(3/5)*(k+1)-((1/4)*(2*k+3)) = 0
(3/5)*(k+1)+(-1/4)*(2*k+3) = 0
3/5*(k+1)-1/4*(2*k+3) = 0
3/5*(k+1)-1/4*(2*k+3) = 0
1/10*k-3/20 = 0
1/10*k-3/20 = 0
1/10*k-3/20 = 0 // + 3/20
1/10*k = 3/20 // : 1/10
k = 3/20/1/10
k = 3/2
k = 3/2
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