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5a-2(a+7)=7
We move all terms to the left:
5a-2(a+7)-(7)=0
We multiply parentheses
5a-2a-14-7=0
We add all the numbers together, and all the variables
3a-21=0
We move all terms containing a to the left, all other terms to the right
3a=21
a=21/3
a=7
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