16-98       16-711      13-410+1

7+713      15-68       12-813-9

11-8=             10-2=             16-7=             18-10=

13-9=             16-9=             14-6=             19-9=

3+8-9=           12-5+8=           13-8+6=           4+9-7=

9+=13           6+=6            10+=14

17-=9          12-=7           4+3=-6