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5a+4=2a+9
We move all terms to the left:
5a+4-(2a+9)=0
We get rid of parentheses
5a-2a-9+4=0
We add all the numbers together, and all the variables
3a-5=0
We move all terms containing a to the left, all other terms to the right
3a=5
a=5/3
a=1+2/3
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