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