5=7+r

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Solution for 5=7+r equation: 



5=7+r

We move all terms to the left:

5-(7+r)=0

We add all the numbers together, and all the variables

-(r+7)+5=0

We get rid of parentheses

-r-7+5=0

We add all the numbers together, and all the variables

-1r-2=0

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

-r=2

r=2/-1

r=-2

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