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4.5=15r-12.6
We move all terms to the left:
4.5-(15r-12.6)=0
We get rid of parentheses
-15r+12.6+4.5=0
We add all the numbers together, and all the variables
-15r+17.1=0
We move all terms containing r to the left, all other terms to the right
-15r=-17.1
r=-17.1/-15
r=1+2.1/15
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