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4a/15=9/15
We move all terms to the left:
4a/15-(9/15)=0
We add all the numbers together, and all the variables
4a/15-(+9/15)=0
We get rid of parentheses
4a/15-9/15=0
We multiply all the terms by the denominator
4a-9=0
We move all terms containing a to the left, all other terms to the right
4a=9
a=9/4
a=2+1/4
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