2=r+5-7

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Solution for 2=r+5-7 equation: 



2=r+5-7

We move all terms to the left:

2-(r+5-7)=0

We add all the numbers together, and all the variables

-(r-2)+2=0

We get rid of parentheses

-r+2+2=0

We add all the numbers together, and all the variables

-1r+4=0

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

-r=-4

r=-4/-1

r=+4

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