2+2-2+2-2+2-2+2-2×7-3
2+2-2+2-2+2-2+2-14-3
\ / \ / \ / \ / \ /
4 - 4 - 4 - 4 - 11
\ / \ / \ /
0 - 0 - (-7)
\ /
0 - (-7)
7