7=-5+-r

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Solution for 7=-5+-r equation: 



7=-5+-r

We move all terms to the left:

7-(-5+-r)=0

We add all the numbers together, and all the variables

-(-1r)+7=0

We get rid of parentheses

1r+7=0

We add all the numbers together, and all the variables

r+7=0

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

r=-7

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