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k in (-oo:+oo)
6*k-(2*k)+5 = 25 // - 25
6*k-(2*k)-25+5 = 0
6*k-2*k-25+5 = 0
4*k-20 = 0 // + 20
4*k = 20 // : 4
k = 20/4
k = 5
k = 5
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