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55.96=3.14159r*8.5
We move all terms to the left:
55.96-(3.14159r*8.5)=0
We add all the numbers together, and all the variables
-(+3.14159r*8.5)+55.96=0
We get rid of parentheses
-3.14159r*8.5+55.96=0
We move all terms containing r to the left, all other terms to the right
-3.14159r*8.5=-55.96
r=-55.96/1
r=-55.96
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