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0.045=0.1r
We move all terms to the left:
0.045-(0.1r)=0
We add all the numbers together, and all the variables
-(+0.1r)+0.045=0
We get rid of parentheses
-0.1r+0.045=0
We move all terms containing r to the left, all other terms to the right
-0.1r=-0.045
r=-0.045/-0.1
r=0.045/0.1
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