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k in (-oo:+oo)
-3*k-9 = -39/5 // + -39/5
-3*k-(-39/5)-9 = 0
39/5-3*k-9 = 0
-3*k-6/5 = 0 // + 6/5
-3*k = 6/5 // : -3
k = 6/5/(-3)
k = -2/5
k = -2/5
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