The answer is-7.
3+(-3)=0
0+(-7)=-7
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If you have negetive 7 and you multiply it by 3 you are just adding negetive 7 three times so it remains negetive
It's 0 man.
The signs are / and + .
18
10 and 3/4 plus 3 and 3/4 = 14 and 1/2 or 14.5