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-(7a+5)=-11-6a
We move all terms to the left:
-(7a+5)-(-11-6a)=0
We add all the numbers together, and all the variables
-(7a+5)-(-6a-11)=0
We get rid of parentheses
-7a+6a-5+11=0
We add all the numbers together, and all the variables
-1a+6=0
We move all terms containing a to the left, all other terms to the right
-a=-6
a=-6/-1
a=+6
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