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k in (-oo:+oo)
7*k-((6/7)*k)+3 = 365/7 // - 365/7
7*k-((6/7)*k)-(365/7)+3 = 0
7*k+(-6/7)*k-365/7+3 = 0
43/7*k-344/7 = 0 // + 344/7
43/7*k = 344/7 // : 43/7
k = 344/7/43/7
k = 8
k = 8
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