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49.2=a7.55
We move all terms to the left:
49.2-(a7.55)=0
We add all the numbers together, and all the variables
-(+a7.55)+49.2=0
We get rid of parentheses
-a7.55+49.2=0
We move all terms containing a to the left, all other terms to the right
-a7.55=-49.2
a=-49.2/1
a=-49.2
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