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29+4.50r=42.50
We move all terms to the left:
29+4.50r-(42.50)=0
We add all the numbers together, and all the variables
4.50r+29-(42.5)=0
We add all the numbers together, and all the variables
4.50r-13.5=0
We move all terms containing r to the left, all other terms to the right
4.50r=13.5
r=13.5/4.50
r=3
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