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150=3.14(10)^2r/3
We move all terms to the left:
150-(3.14(10)^2r/3)=0
We get rid of parentheses
-3.1410^2r/3+150=0
We multiply all the terms by the denominator
-3.1410^2r+150*3=0
We add all the numbers together, and all the variables
-3.1410^2r+450=0
We move all terms containing r to the left, all other terms to the right
-3.1410^2r=-450
r=-450/1
r=-450
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