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k in (-oo:+oo)
3/5-2*k = -57/5 // + -57/5
3/5-2*k-(-57/5) = 0
3/5-2*k+57/5 = 0
12-2*k = 0 // - 12
-2*k = -12 // : -2
k = -12/(-2)
k = 6
k = 6
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