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-6a-11=2a+21
We move all terms to the left:
-6a-11-(2a+21)=0
We get rid of parentheses
-6a-2a-21-11=0
We add all the numbers together, and all the variables
-8a-32=0
We move all terms containing a to the left, all other terms to the right
-8a=32
a=32/-8
a=-4
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