13=r+8

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Solution for 13=r+8 equation:



13=r+8
We move all terms to the left:
13-(r+8)=0
We get rid of parentheses
-r-8+13=0
We add all the numbers together, and all the variables
-1r+5=0
We move all terms containing r to the left, all other terms to the right
-r=-5
r=-5/-1
r=+5

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