-4=r-2-7

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



-4=r-2-7

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(r-9)-4=0

We get rid of parentheses

-r+9-4=0

We add all the numbers together, and all the variables

-1r+5=0

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

-r=-5

r=-5/-1

r=+5

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