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k in (-oo:+oo)
(-3/7)*k = 9/5 // - 9/5
(-3/7)*k-(9/5) = 0
(-3/7)*k-9/5 = 0
-3/7*k-9/5 = 0 // + 9/5
-3/7*k = 9/5 // : -3/7
k = 9/5/(-3/7)
k = -21/5
k = -21/5
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