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26.88=a-39.45
We move all terms to the left:
26.88-(a-39.45)=0
We get rid of parentheses
-a+39.45+26.88=0
We add all the numbers together, and all the variables
-1a+66.33=0
We move all terms containing a to the left, all other terms to the right
-a=-66.33
a=-66.33/-1
a=66+0.33/1
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