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6a-9a-4=12-14
We move all terms to the left:
6a-9a-4-(12-14)=0
We add all the numbers together, and all the variables
6a-9a-4-(-2)=0
We add all the numbers together, and all the variables
-3a-2=0
We move all terms containing a to the left, all other terms to the right
-3a=2
a=2/-3
a=-2/3
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