-15+-3r=-45

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Solution for -15+-3r=-45 equation: 



-15+-3r=-45

We move all terms to the left:

-15+-3r-(-45)=0

We add all the numbers together, and all the variables

-3r+30=0

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

-3r=-30

r=-30/-3

r=+10

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