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-64=a/2
We move all terms to the left:
-64-(a/2)=0
We add all the numbers together, and all the variables
-(+a/2)-64=0
We get rid of parentheses
-a/2-64=0
We multiply all the terms by the denominator
-a-64*2=0
We add all the numbers together, and all the variables
-1a-128=0
We move all terms containing a to the left, all other terms to the right
-a=128
a=128/-1
a=-128
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