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-7.3+r/3=-0.739
We move all terms to the left:
-7.3+r/3-(-0.739)=0
We add all the numbers together, and all the variables
r/3-6.561=0
We multiply all the terms by the denominator
r-(6.561)*3=0
We add all the numbers together, and all the variables
r-19.683=0
We move all terms containing r to the left, all other terms to the right
r=19.683
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