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4a-9=6a+7a=
We move all terms to the left:
4a-9-(6a+7a)=0
We add all the numbers together, and all the variables
4a-(+13a)-9=0
We get rid of parentheses
4a-13a-9=0
We add all the numbers together, and all the variables
-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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