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-24=-4r+4
We move all terms to the left:
-24-(-4r+4)=0
We get rid of parentheses
4r-4-24=0
We add all the numbers together, and all the variables
4r-28=0
We move all terms containing r to the left, all other terms to the right
4r=28
r=28/4
r=7
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