-40=-7+3r

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Solution for -40=-7+3r equation: 



-40=-7+3r

We move all terms to the left:

-40-(-7+3r)=0

We add all the numbers together, and all the variables

-(3r-7)-40=0

We get rid of parentheses

-3r+7-40=0

We add all the numbers together, and all the variables

-3r-33=0

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

-3r=33

r=33/-3

r=-11

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