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8a=9a-5
We move all terms to the left:
8a-(9a-5)=0
We get rid of parentheses
8a-9a+5=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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