elimine os parentes e calcule A) 7- (-6) - (+3) 
B) - 8 + (-6) -(+3) 
C) 5 -6 - (+7) +1 
D) -28 +7 + (+12) + (-1) -6 
E) - 21 - 7 - 6 - (-15) - 2 -(-10 
F) 10 - (8) + (-9) - (-12) - 6 + 5
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