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k in (-oo:+oo)
7*k-2 = 3*k+22 // - 3*k+22
7*k-(3*k)-22-2 = 0
7*k-3*k-22-2 = 0
4*k-24 = 0 // + 24
4*k = 24 // : 4
k = 24/4
k = 6
k = 6
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