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k in (-oo:+oo)
k/17 = 20/68 // - 20/68
k/17-(20/68) = 0
k/17-5/17 = 0
1/17*k-5/17 = 0 // + 5/17
1/17*k = 5/17 // : 1/17
k = 5/17/1/17
k = 5
k = 5
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