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r-10=-10-r
We move all terms to the left:
r-10-(-10-r)=0
We add all the numbers together, and all the variables
r-(-1r-10)-10=0
We get rid of parentheses
r+1r+10-10=0
We add all the numbers together, and all the variables
2r=0
r=0/2
r=0
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