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k in (-oo:+oo)
3*k+7 = 5*k+1 // - 5*k+1
3*k-(5*k)-1+7 = 0
3*k-5*k-1+7 = 0
6-2*k = 0 // - 6
-2*k = -6 // : -2
k = -6/(-2)
k = 3
k = 3
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