Решите пожалуйста.

1) -1/5-(-3/5)-3/5+(-1/7)=
2) -3/4-(-1/6)-(+1/2)-(+5/6)=
3) -3/7-(+4/7)+5/9-(+4/9)=
4) 2,7-(+4)-(-9)-(+2)=
5) 12,5+(-7)+4-(-8)=
Полное решение не нужно. Только ответ.
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