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k in (-oo:+oo)
k/50 = 9/30 // - 9/30
k/50-(9/30) = 0
k/50-3/10 = 0
1/50*k-3/10 = 0 // + 3/10
1/50*k = 3/10 // : 1/50
k = 3/10/1/50
k = 15
k = 15
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