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16+7(r-4)=30
We move all terms to the left:
16+7(r-4)-(30)=0
We add all the numbers together, and all the variables
7(r-4)-14=0
We multiply parentheses
7r-28-14=0
We add all the numbers together, and all the variables
7r-42=0
We move all terms containing r to the left, all other terms to the right
7r=42
r=42/7
r=6
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