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4(8r-7)=-124
We move all terms to the left:
4(8r-7)-(-124)=0
We add all the numbers together, and all the variables
4(8r-7)+124=0
We multiply parentheses
32r-28+124=0
We add all the numbers together, and all the variables
32r+96=0
We move all terms containing r to the left, all other terms to the right
32r=-96
r=-96/32
r=-3
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