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-13/4=a/4
We move all terms to the left:
-13/4-(a/4)=0
We add all the numbers together, and all the variables
-(+a/4)-13/4=0
We get rid of parentheses
-a/4-13/4=0
We multiply all the terms by the denominator
-a-13=0
We add all the numbers together, and all the variables
-1a-13=0
We move all terms containing a to the left, all other terms to the right
-a=13
a=13/-1
a=-13
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