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4(r/3)=40
We move all terms to the left:
4(r/3)-(40)=0
We add all the numbers together, and all the variables
4(+r/3)-40=0
We multiply parentheses
4r-40=0
We move all terms containing r to the left, all other terms to the right
4r=40
r=40/4
r=10
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