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2=3r+-13
We move all terms to the left:
2-(3r+-13)=0
We add all the numbers together, and all the variables
-(3r-13)+2=0
We get rid of parentheses
-3r+13+2=0
We add all the numbers together, and all the variables
-3r+15=0
We move all terms containing r to the left, all other terms to the right
-3r=-15
r=-15/-3
r=+5
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