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8a-9a-(-2)=10
We move all terms to the left:
8a-9a-(-2)-(10)=0
determiningTheFunctionDomain 8a-9a-10-(-2)=0
We add all the numbers together, and all the variables
-1a-8=0
We move all terms containing a to the left, all other terms to the right
-a=8
a=8/-1
a=-8
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