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7+8a=3+6a+7+13
We move all terms to the left:
7+8a-(3+6a+7+13)=0
We add all the numbers together, and all the variables
8a-(6a+23)+7=0
We get rid of parentheses
8a-6a-23+7=0
We add all the numbers together, and all the variables
2a-16=0
We move all terms containing a to the left, all other terms to the right
2a=16
a=16/2
a=8
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