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-2a=-9a-9a
We move all terms to the left:
-2a-(-9a-9a)=0
We add all the numbers together, and all the variables
-2a-(-18a)=0
We get rid of parentheses
-2a+18a=0
We add all the numbers together, and all the variables
16a=0
a=0/16
a=0
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