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-10+2r=-7-3+2r
We move all terms to the left:
-10+2r-(-7-3+2r)=0
We add all the numbers together, and all the variables
2r-(2r-10)-10=0
We get rid of parentheses
2r-2r+10-10=0
We add all the numbers together, and all the variables
=0
r=0/1
r=0
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