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-10-8r=-10r+10
We move all terms to the left:
-10-8r-(-10r+10)=0
We get rid of parentheses
-8r+10r-10-10=0
We add all the numbers together, and all the variables
2r-20=0
We move all terms containing r to the left, all other terms to the right
2r=20
r=20/2
r=10
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