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k in (-oo:+oo)
2*(k/4-3)+2*k-k+1 = 25 // - 25
2*(k/4-3)+2*k-k-25+1 = 0
2*(1/4*k-3)+2*k-k-25+1 = 0
2*(1/4*k-3)+2*k-k-25+1 = 0
5/2*k-k-25-6+1 = 0
3/2*k-25-6+1 = 0
3/2*k-31+1 = 0
3/2*k-30 = 0
3/2*k-30 = 0
3/2*k-30 = 0 // + 30
3/2*k = 30 // : 3/2
k = 30/3/2
k = 20
k = 20
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