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-7(6r+7)=-385
We move all terms to the left:
-7(6r+7)-(-385)=0
We add all the numbers together, and all the variables
-7(6r+7)+385=0
We multiply parentheses
-42r-49+385=0
We add all the numbers together, and all the variables
-42r+336=0
We move all terms containing r to the left, all other terms to the right
-42r=-336
r=-336/-42
r=+8
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