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3a+(a+5)=424
We move all terms to the left:
3a+(a+5)-(424)=0
We get rid of parentheses
3a+a+5-424=0
We add all the numbers together, and all the variables
4a-419=0
We move all terms containing a to the left, all other terms to the right
4a=419
a=419/4
a=104+3/4
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