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k in (-oo:+oo)
3-7*k = -3*k-13 // + -3*k-13
3-7*k-(-3*k)+13 = 0
3*k-7*k+3+13 = 0
16-4*k = 0 // - 16
-4*k = -16 // : -4
k = -16/(-4)
k = 4
k = 4
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