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k in (-oo:+oo)
-2*k-3 = 3*k+37 // - 3*k+37
-2*k-(3*k)-37-3 = 0
-2*k-3*k-37-3 = 0
-5*k-40 = 0 // + 40
-5*k = 40 // : -5
k = 40/(-5)
k = -8
k = -8
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