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7a+8=4a+29
We move all terms to the left:
7a+8-(4a+29)=0
We get rid of parentheses
7a-4a-29+8=0
We add all the numbers together, and all the variables
3a-21=0
We move all terms containing a to the left, all other terms to the right
3a=21
a=21/3
a=7
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