-13=-8+r/3

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Solution for -13=-8+r/3 equation: 



-13=-8+r/3

We move all terms to the left:

-13-(-8+r/3)=0

We add all the numbers together, and all the variables

-(r/3-8)-13=0

We get rid of parentheses

-r/3+8-13=0

We multiply all the terms by the denominator


-r+8*3-13*3=0

We add all the numbers together, and all the variables

-1r-15=0

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

-r=15

r=15/-1

r=-15

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