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8r-4(8r+3)=22-7r
We move all terms to the left:
8r-4(8r+3)-(22-7r)=0
We add all the numbers together, and all the variables
8r-4(8r+3)-(-7r+22)=0
We multiply parentheses
8r-32r-(-7r+22)-12=0
We get rid of parentheses
8r-32r+7r-22-12=0
We add all the numbers together, and all the variables
-17r-34=0
We move all terms containing r to the left, all other terms to the right
-17r=34
r=34/-17
r=-2
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