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-4(r-93)=36
We move all terms to the left:
-4(r-93)-(36)=0
We multiply parentheses
-4r+372-36=0
We add all the numbers together, and all the variables
-4r+336=0
We move all terms containing r to the left, all other terms to the right
-4r=-336
r=-336/-4
r=+84
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