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7=8-r
We move all terms to the left:
7-(8-r)=0
We add all the numbers together, and all the variables
-(-1r+8)+7=0
We get rid of parentheses
1r-8+7=0
We add all the numbers together, and all the variables
r-1=0
We move all terms containing r to the left, all other terms to the right
r=1
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