2=7+r

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Solution for 2=7+r equation: 



2=7+r

We move all terms to the left:

2-(7+r)=0

We add all the numbers together, and all the variables

-(r+7)+2=0

We get rid of parentheses

-r-7+2=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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