13=7+3r

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Solution for 13=7+3r equation:



13=7+3r
We move all terms to the left:
13-(7+3r)=0
We add all the numbers together, and all the variables
-(3r+7)+13=0
We get rid of parentheses
-3r-7+13=0
We add all the numbers together, and all the variables
-3r+6=0
We move all terms containing r to the left, all other terms to the right
-3r=-6
r=-6/-3
r=+2

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