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k in (-oo:+oo)
2*k-10 = 3*k-1 // - 3*k-1
2*k-(3*k)-10+1 = 0
2*k-3*k-10+1 = 0
-k-9 = 0 // + 9
-k = 9 // * -1
k = -9
k = -9
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