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-3+r/6=10
We move all terms to the left:
-3+r/6-(10)=0
We add all the numbers together, and all the variables
r/6-13=0
We multiply all the terms by the denominator
r-13*6=0
We add all the numbers together, and all the variables
r-78=0
We move all terms containing r to the left, all other terms to the right
r=78
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