13=r+7

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Solution for 13=r+7 equation:



13=r+7
We move all terms to the left:
13-(r+7)=0
We get rid of parentheses
-r-7+13=0
We add all the numbers together, and all the variables
-1r+6=0
We move all terms containing r to the left, all other terms to the right
-r=-6
r=-6/-1
r=+6

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