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k in (-oo:+oo)
k/56 = 12/7 // - 12/7
k/56-(12/7) = 0
k/56-12/7 = 0
1/56*k-12/7 = 0 // + 12/7
1/56*k = 12/7 // : 1/56
k = 12/7/1/56
k = 96
k = 96
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