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k in (-oo:+oo)
3*k+8 = -5*k-16 // + -5*k-16
3*k-(-5*k)+8+16 = 0
3*k+5*k+8+16 = 0
8*k+24 = 0 // - 24
8*k = -24 // : 8
k = -24/8
k = -3
k = -3
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