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k in (-oo:+oo)
(-6/7)*k+7 = 113/7-2*k // - 113/7-2*k
(-6/7)*k-(-2*k)-(113/7)+7 = 0
(-6/7)*k+2*k-113/7+7 = 0
8/7*k-64/7 = 0 // + 64/7
8/7*k = 64/7 // : 8/7
k = 64/7/8/7
k = 8
k = 8
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