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k in (-oo:+oo)
2*k-(3/(-5)) = 7 // - 7
2*k-(3/(-5))-7 = 0
2*k+3/5-7 = 0
2*k-32/5 = 0 // + 32/5
2*k = 32/5 // : 2
k = 32/5/2
k = 16/5
k = 16/5
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