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-7(7-3a)+a=31+6a
We move all terms to the left:
-7(7-3a)+a-(31+6a)=0
We add all the numbers together, and all the variables
-7(-3a+7)+a-(6a+31)=0
We add all the numbers together, and all the variables
a-7(-3a+7)-(6a+31)=0
We multiply parentheses
a+21a-(6a+31)-49=0
We get rid of parentheses
a+21a-6a-31-49=0
We add all the numbers together, and all the variables
16a-80=0
We move all terms containing a to the left, all other terms to the right
16a=80
a=80/16
a=5
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