15=11+r

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Solution for 15=11+r equation: 



15=11+r

We move all terms to the left:

15-(11+r)=0

We add all the numbers together, and all the variables

-(r+11)+15=0

We get rid of parentheses

-r-11+15=0

We add all the numbers together, and all the variables

-1r+4=0

We move all terms containing r to the left, all other terms to the right

-r=-4

r=-4/-1

r=+4

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