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a-3/21-3a/21=5/21
We move all terms to the left:
a-3/21-3a/21-(5/21)=0
We add all the numbers together, and all the variables
a-3a/21-3/21-(+5/21)=0
We get rid of parentheses
a-3a/21-3/21-5/21=0
We multiply all the terms by the denominator
a*21-3a-3-5=0
We add all the numbers together, and all the variables
-3a+a*21-8=0
Wy multiply elements
-3a+21a-8=0
We add all the numbers together, and all the variables
18a-8=0
We move all terms containing a to the left, all other terms to the right
18a=8
a=8/18
a=4/9
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