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5a-(6-a)=3a-21
We move all terms to the left:
5a-(6-a)-(3a-21)=0
We add all the numbers together, and all the variables
5a-(-1a+6)-(3a-21)=0
We get rid of parentheses
5a+1a-3a-6+21=0
We add all the numbers together, and all the variables
3a+15=0
We move all terms containing a to the left, all other terms to the right
3a=-15
a=-15/3
a=-5
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