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(-7r+9)=72
We move all terms to the left:
(-7r+9)-(72)=0
We get rid of parentheses
-7r+9-72=0
We add all the numbers together, and all the variables
-7r-63=0
We move all terms containing r to the left, all other terms to the right
-7r=63
r=63/-7
r=-9
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