7=4+r

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Solution for 7=4+r equation: 



7=4+r

We move all terms to the left:

7-(4+r)=0

We add all the numbers together, and all the variables

-(r+4)+7=0

We get rid of parentheses

-r-4+7=0

We add all the numbers together, and all the variables

-1r+3=0

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

-r=-3

r=-3/-1

r=+3

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