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k in (-oo:+oo)
(k+1)/2+(k+3)/4 = -2 // + 2
(k+1)/2+(k+3)/4+2 = 0
(4*(k+1))/(2*4)+(2*(k+3))/(2*4)+(4*2^2)/(2*4) = 0
4*(k+1)+2*(k+3)+4*2^2 = 0
6*k+10+16 = 0
6*k+26 = 0
(6*k+26)/(2*4) = 0
(6*k+26)/(2*4) = 0 // * 2*4
6*k+26 = 0
6*k+26 = 0 // - 26
6*k = -26 // : 6
k = -26/6
k = -13/3
k = -13/3
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