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k in (-oo:+oo)
7*k+10 = 2*k+60 // - 2*k+60
7*k-(2*k)-60+10 = 0
7*k-2*k-60+10 = 0
5*k-50 = 0 // + 50
5*k = 50 // : 5
k = 50/5
k = 10
k = 10
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