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-10-8r=10-10r
We move all terms to the left:
-10-8r-(10-10r)=0
We add all the numbers together, and all the variables
-8r-(-10r+10)-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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