4=4-2r-7r

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Solution for 4=4-2r-7r equation: 



4=4-2r-7r

We move all terms to the left:

4-(4-2r-7r)=0

We add all the numbers together, and all the variables

-(-9r+4)+4=0

We get rid of parentheses

9r-4+4=0

We add all the numbers together, and all the variables

9r=0

r=0/9

r=0

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