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8a/9-7=9
We move all terms to the left:
8a/9-7-(9)=0
We add all the numbers together, and all the variables
8a/9-16=0
We multiply all the terms by the denominator
8a-16*9=0
We add all the numbers together, and all the variables
8a-144=0
We move all terms containing a to the left, all other terms to the right
8a=144
a=144/8
a=18
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