-7r-8r=13-2r

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Solution for -7r-8r=13-2r equation: 



-7r-8r=13-2r

We move all terms to the left:

-7r-8r-(13-2r)=0

We add all the numbers together, and all the variables

-7r-8r-(-2r+13)=0

We add all the numbers together, and all the variables

-15r-(-2r+13)=0

We get rid of parentheses

-15r+2r-13=0

We add all the numbers together, and all the variables

-13r-13=0

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

-13r=13

r=13/-13

r=-1

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