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8=a/5-9
We move all terms to the left:
8-(a/5-9)=0
We get rid of parentheses
-a/5+9+8=0
We multiply all the terms by the denominator
-a+9*5+8*5=0
We add all the numbers together, and all the variables
-1a+85=0
We move all terms containing a to the left, all other terms to the right
-a=-85
a=-85/-1
a=+85
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