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10a=408-7a=
We move all terms to the left:
10a-(408-7a)=0
We add all the numbers together, and all the variables
10a-(-7a+408)=0
We get rid of parentheses
10a+7a-408=0
We add all the numbers together, and all the variables
17a-408=0
We move all terms containing a to the left, all other terms to the right
17a=408
a=408/17
a=24
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