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k in (-oo:+oo)
(-5/7)*k+10 = 75/7 // - 75/7
(-5/7)*k-(75/7)+10 = 0
(-5/7)*k-75/7+10 = 0
-5/7*k-5/7 = 0 // + 5/7
-5/7*k = 5/7 // : -5/7
k = 5/7/(-5/7)
k = -1
k = -1
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