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8(7r+8)-5r=319
We move all terms to the left:
8(7r+8)-5r-(319)=0
We add all the numbers together, and all the variables
-5r+8(7r+8)-319=0
We multiply parentheses
-5r+56r+64-319=0
We add all the numbers together, and all the variables
51r-255=0
We move all terms containing r to the left, all other terms to the right
51r=255
r=255/51
r=5
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