-3r-1=-40

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Solution for -3r-1=-40 equation: 



-3r-1=-40

We move all terms to the left:

-3r-1-(-40)=0

We add all the numbers together, and all the variables

-3r+39=0

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

-3r=-39

r=-39/-3

r=+13

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