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k in (-oo:+oo)
k/64 = 8.7 // - 8.7
k/64-8.7 = 0
1/64*k-8.7 = 0 // + 8.7
1/64*k = 8.7 // : 1/64
k = 8.7/1/64
k = 556.8
k = 556.8
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