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-(-a)=-20
We move all terms to the left:
-(-a)-(-20)=0
We add all the numbers together, and all the variables
-(-1a)-(-20)=0
We add all the numbers together, and all the variables
-(-1a)+20=0
We get rid of parentheses
1a+20=0
We add all the numbers together, and all the variables
a+20=0
We move all terms containing a to the left, all other terms to the right
a=-20
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