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