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24=99-r
We move all terms to the left:
24-(99-r)=0
We add all the numbers together, and all the variables
-(-1r+99)+24=0
We get rid of parentheses
1r-99+24=0
We add all the numbers together, and all the variables
r-75=0
We move all terms containing r to the left, all other terms to the right
r=75
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