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55.98=3.14159r*8.5
We move all terms to the left:
55.98-(3.14159r*8.5)=0
We add all the numbers together, and all the variables
-(+3.14159r*8.5)+55.98=0
We get rid of parentheses
-3.14159r*8.5+55.98=0
We move all terms containing r to the left, all other terms to the right
-3.14159r*8.5=-55.98
r=-55.98/1
r=-55.98
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