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k in (-oo:+oo)
-5*k-4 = 3*k+52 // - 3*k+52
-5*k-(3*k)-52-4 = 0
-5*k-3*k-52-4 = 0
-8*k-56 = 0 // + 56
-8*k = 56 // : -8
k = 56/(-8)
k = -7
k = -7
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