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k in (-oo:+oo)
3*k-((1/7)*k)+1 = 227/7 // - 227/7
3*k-((1/7)*k)-(227/7)+1 = 0
3*k+(-1/7)*k-227/7+1 = 0
20/7*k-220/7 = 0 // + 220/7
20/7*k = 220/7 // : 20/7
k = 220/7/20/7
k = 11
k = 11
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