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3(8+4a)-2(10+7)=0
We add all the numbers together, and all the variables
3(4a+8)-217=0
We multiply parentheses
12a+24-217=0
We add all the numbers together, and all the variables
12a-193=0
We move all terms containing a to the left, all other terms to the right
12a=193
a=193/12
a=16+1/12
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