15=-r+4

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Solution for 15=-r+4 equation: 



15=-r+4

We move all terms to the left:

15-(-r+4)=0

We add all the numbers together, and all the variables

-(-1r+4)+15=0

We get rid of parentheses

1r-4+15=0

We add all the numbers together, and all the variables

r+11=0

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

r=-11

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