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k in (-oo:+oo)
610/63 = (2/7)*k-k+10 // - (2/7)*k-k+10
k-((2/7)*k)+610/63-10 = 0
k+(-2/7)*k+610/63-10 = 0
5/7*k-20/63 = 0 // + 20/63
5/7*k = 20/63 // : 5/7
k = 20/63/5/7
k = 4/9
k = 4/9
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