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-6=0.75r-9
We move all terms to the left:
-6-(0.75r-9)=0
We get rid of parentheses
-0.75r+9-6=0
We add all the numbers together, and all the variables
-0.75r+3=0
We move all terms containing r to the left, all other terms to the right
-0.75r=-3
r=-3/-0.75
r=+4
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