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2(13-r)=10
We move all terms to the left:
2(13-r)-(10)=0
We add all the numbers together, and all the variables
2(-1r+13)-10=0
We multiply parentheses
-2r+26-10=0
We add all the numbers together, and all the variables
-2r+16=0
We move all terms containing r to the left, all other terms to the right
-2r=-16
r=-16/-2
r=+8
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