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k in (-oo:+oo)
10-k = (-1/3)*k+72/7 // - (-1/3)*k+72/7
10-k-((-1/3)*k)-(72/7) = 0
(1/3)*k-k-72/7+10 = 0
-2/3*k-2/7 = 0 // + 2/7
-2/3*k = 2/7 // : -2/3
k = 2/7/(-2/3)
k = -3/7
k = -3/7
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