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4=a-64.9+1
We move all terms to the left:
4-(a-64.9+1)=0
We add all the numbers together, and all the variables
-(a-63.9)+4=0
We get rid of parentheses
-a+63.9+4=0
We add all the numbers together, and all the variables
-1a+67.9=0
We move all terms containing a to the left, all other terms to the right
-a=-67.9
a=-67.9/-1
a=67+0.90000000000001/1
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