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7(2r-7)=-7
We move all terms to the left:
7(2r-7)-(-7)=0
We add all the numbers together, and all the variables
7(2r-7)+7=0
We multiply parentheses
14r-49+7=0
We add all the numbers together, and all the variables
14r-42=0
We move all terms containing r to the left, all other terms to the right
14r=42
r=42/14
r=3
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