\[|v| - 6u = 3 - 7u\]
\[- 6u + 7u = 3 - |v|\]
\[u = 3 - |v|\]
\[v = - 25:\]
\[u = 3 - | - 25| = 3 - 25 = - 22.\]
\[v = 0:\]
\[u = 3 - |0| = 3 - 0 = 3.\]
\[v = 4:\]
\[\ u = 3 - |4| = 3 - 4 = - 1.\]