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k in (-oo:+oo)
(4*k+5)/3 = 2*k+7 // - 2*k+7
(4*k+5)/3-(2*k)-7 = 0
(4*k+5)/3-2*k-7 = 0
(4*k+5)/3+(-2*3*k)/3+(-7*3)/3 = 0
4*k-2*3*k-7*3+5 = 0
5-2*k-21 = 0
-2*k-16 = 0
(-2*k-16)/3 = 0
(-2*k-16)/3 = 0 // * 3
-2*k-16 = 0
-2*k-16 = 0 // + 16
-2*k = 16 // : -2
k = 16/(-2)
k = -8
k = -8
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