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9a+28=4a+3.
We move all terms to the left:
9a+28-(4a+3.)=0
We add all the numbers together, and all the variables
9a-(4a+3)+28=0
We get rid of parentheses
9a-4a-3+28=0
We add all the numbers together, and all the variables
5a+25=0
We move all terms containing a to the left, all other terms to the right
5a=-25
a=-25/5
a=-5
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