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k in (-oo:+oo)
7*k+10 = 2*k+35 // - 2*k+35
7*k-(2*k)-35+10 = 0
7*k-2*k-35+10 = 0
5*k-25 = 0 // + 25
5*k = 25 // : 5
k = 25/5
k = 5
k = 5
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