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k in (-oo:+oo)
3*k-2 = 7*k-10 // - 7*k-10
3*k-(7*k)-2+10 = 0
3*k-7*k-2+10 = 0
8-4*k = 0 // - 8
-4*k = -8 // : -4
k = -8/(-4)
k = 2
k = 2
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