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10=r+6+3
We move all terms to the left:
10-(r+6+3)=0
We add all the numbers together, and all the variables
-(r+9)+10=0
We get rid of parentheses
-r-9+10=0
We add all the numbers together, and all the variables
-1r+1=0
We move all terms containing r to the left, all other terms to the right
-r=-1
r=-1/-1
r=1
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