1)2-5-4+12=-3-4+12=-7+12=5
2)-4+6+3-12=2+3-12=5-12=-7
3)4-7-3+14=-3-3+14=-6+14=8
4)-4+10-13+8=6+10-13+8=16-13+8 =3+8=11
5)-2-6+13-5=-8+13-5=5-5=0
6)3-11+14-9=-8+14-9=6-9=-3
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1)2-5-4+12=-3-4+12=-7+12=5
2)-4+6+3-12=2+3-12=5-12=-7
3)4-7-3+14=-3-3+14=-6+14=8
4)-4+10-13+8=6+10-13+8=16-13+8 =3+8=11
5)-2-6+13-5=-8+13-5=5-5=0
6)3-11+14-9=-8+14-9=6-9=-3