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-3=13-a/4
We move all terms to the left:
-3-(13-a/4)=0
We add all the numbers together, and all the variables
-(-a/4+13)-3=0
We get rid of parentheses
a/4-13-3=0
We multiply all the terms by the denominator
a-13*4-3*4=0
We add all the numbers together, and all the variables
a-64=0
We move all terms containing a to the left, all other terms to the right
a=64
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