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-3=21-6a
We move all terms to the left:
-3-(21-6a)=0
We add all the numbers together, and all the variables
-(-6a+21)-3=0
We get rid of parentheses
6a-21-3=0
We add all the numbers together, and all the variables
6a-24=0
We move all terms containing a to the left, all other terms to the right
6a=24
a=24/6
a=4
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