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9a+28=4a+39a+28=4a+3
We move all terms to the left:
9a+28-(4a+39a+28)=0
We add all the numbers together, and all the variables
9a-(43a+28)+28=0
We get rid of parentheses
9a-43a-28+28=0
We add all the numbers together, and all the variables
-34a=0
a=0/-34
a=0
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