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k in (-oo:+oo)
-14 = 7*k-3*k-10 // - 7*k-3*k-10
10-(-3*k)-(7*k)-14 = 0
3*k-7*k-14+10 = 0
-4*k-4 = 0 // + 4
-4*k = 4 // : -4
k = 4/(-4)
k = -1
k = -1
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