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k in (-oo:+oo)
k/21 = 7/3 // - 7/3
k/21-(7/3) = 0
k/21-7/3 = 0
1/21*k-7/3 = 0 // + 7/3
1/21*k = 7/3 // : 1/21
k = 7/3/1/21
k = 49
k = 49
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