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k in (-oo:+oo)
8-(3*k) = 7-2*k // - 7-2*k
8-(3*k)-(-2*k)-7 = 0
2*k-3*k-7+8 = 0
1-k = 0 // - 1
-k = -1 // * -1
k = 1
k = 1
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