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9=7+aa+8=+5
We move all terms to the left:
9-(7+aa+8)=0
We add all the numbers together, and all the variables
-(aa+15)+9=0
We get rid of parentheses
-aa-15+9=0
We add all the numbers together, and all the variables
-aa-6=0
We move all terms containing a to the left, all other terms to the right
-aa=6
a=6/1
a=6
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