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7+7r=-6+8r+7
We move all terms to the left:
7+7r-(-6+8r+7)=0
We add all the numbers together, and all the variables
7r-(8r+1)+7=0
We get rid of parentheses
7r-8r-1+7=0
We add all the numbers together, and all the variables
-1r+6=0
We move all terms containing r to the left, all other terms to the right
-r=-6
r=-6/-1
r=+6
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