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10-8r=-7r
We move all terms to the left:
10-8r-(-7r)=0
We get rid of parentheses
-8r+7r+10=0
We add all the numbers together, and all the variables
-1r+10=0
We move all terms containing r to the left, all other terms to the right
-r=-10
r=-10/-1
r=+10
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