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-5(2-r)=30
We move all terms to the left:
-5(2-r)-(30)=0
We add all the numbers together, and all the variables
-5(-1r+2)-30=0
We multiply parentheses
5r-10-30=0
We add all the numbers together, and all the variables
5r-40=0
We move all terms containing r to the left, all other terms to the right
5r=40
r=40/5
r=8
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