-4=-15+r

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Solution for -4=-15+r equation: 



-4=-15+r

We move all terms to the left:

-4-(-15+r)=0

We add all the numbers together, and all the variables

-(r-15)-4=0

We get rid of parentheses

-r+15-4=0

We add all the numbers together, and all the variables

-1r+11=0

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

-r=-11

r=-11/-1

r=+11

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