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k in (-oo:+oo)
3*k+7 = 5*k+29 // - 5*k+29
3*k-(5*k)-29+7 = 0
3*k-5*k-29+7 = 0
-2*k-22 = 0 // + 22
-2*k = 22 // : -2
k = 22/(-2)
k = -11
k = -11
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