14-4=           10+2=         3+7=         2+3+4=

14+4=          15-1=          13-3=         8+2-6=

16-2=           13+2=         6+4=         13-3-5=

10-39             14+316          10-6-25

18-515           15-311            109+4-3

2+=10             -4=6             5+=17

13-=11            -5=5              +6=18