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k in (-oo:+oo)
(3/7)*k = 33/7 // - 33/7
(3/7)*k-(33/7) = 0
(3/7)*k-33/7 = 0
3/7*k-33/7 = 0 // + 33/7
3/7*k = 33/7 // : 3/7
k = 33/7/3/7
k = 11
k = 11
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