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4a+9=8a+3
We move all terms to the left:
4a+9-(8a+3)=0
We get rid of parentheses
4a-8a-3+9=0
We add all the numbers together, and all the variables
-4a+6=0
We move all terms containing a to the left, all other terms to the right
-4a=-6
a=-6/-4
a=1+1/2
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