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k in (-oo:+oo)
3-5*k = -3*k-15 // + -3*k-15
3-5*k-(-3*k)+15 = 0
3*k-5*k+3+15 = 0
18-2*k = 0 // - 18
-2*k = -18 // : -2
k = -18/(-2)
k = 9
k = 9
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