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k in (-oo:+oo)
2*k-(10/(-7)) = 10 // - 10
2*k-(10/(-7))-10 = 0
2*k+10/7-10 = 0
2*k-60/7 = 0 // + 60/7
2*k = 60/7 // : 2
k = 60/7/2
k = 30/7
k = 30/7
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