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-3.5=8-a
We move all terms to the left:
-3.5-(8-a)=0
We add all the numbers together, and all the variables
-(-1a+8)-3.5=0
We get rid of parentheses
1a-8-3.5=0
We add all the numbers together, and all the variables
a-11.5=0
We move all terms containing a to the left, all other terms to the right
a=11.5
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