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-13=a/2
We move all terms to the left:
-13-(a/2)=0
We add all the numbers together, and all the variables
-(+a/2)-13=0
We get rid of parentheses
-a/2-13=0
We multiply all the terms by the denominator
-a-13*2=0
We add all the numbers together, and all the variables
-1a-26=0
We move all terms containing a to the left, all other terms to the right
-a=26
a=26/-1
a=-26
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