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300=6(7r+1)
We move all terms to the left:
300-(6(7r+1))=0
We calculate terms in parentheses: -(6(7r+1)), so:We get rid of parentheses
6(7r+1)
We multiply parentheses
42r+6
Back to the equation:
-(42r+6)
-42r-6+300=0
We add all the numbers together, and all the variables
-42r+294=0
We move all terms containing r to the left, all other terms to the right
-42r=-294
r=-294/-42
r=+7
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