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-2=r/10
We move all terms to the left:
-2-(r/10)=0
We add all the numbers together, and all the variables
-(+r/10)-2=0
We get rid of parentheses
-r/10-2=0
We multiply all the terms by the denominator
-r-2*10=0
We add all the numbers together, and all the variables
-1r-20=0
We move all terms containing r to the left, all other terms to the right
-r=20
r=20/-1
r=-20
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