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3(a+4)+5a=28
We move all terms to the left:
3(a+4)+5a-(28)=0
We add all the numbers together, and all the variables
5a+3(a+4)-28=0
We multiply parentheses
5a+3a+12-28=0
We add all the numbers together, and all the variables
8a-16=0
We move all terms containing a to the left, all other terms to the right
8a=16
a=16/8
a=2
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