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2(2a+5a)=28
We move all terms to the left:
2(2a+5a)-(28)=0
We add all the numbers together, and all the variables
2(+7a)-28=0
We multiply parentheses
14a-28=0
We move all terms containing a to the left, all other terms to the right
14a=28
a=28/14
a=2
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