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k in (-oo:+oo)
(4/7)*k+3 = 41/7 // - 41/7
(4/7)*k-(41/7)+3 = 0
(4/7)*k-41/7+3 = 0
4/7*k-20/7 = 0 // + 20/7
4/7*k = 20/7 // : 4/7
k = 20/7/4/7
k = 5
k = 5
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