4r-7r=-30

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Solution for 4r-7r=-30 equation: 



4r-7r=-30

We move all terms to the left:

4r-7r-(-30)=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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