7=8-r

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Solution for 7=8-r equation: 



7=8-r

We move all terms to the left:

7-(8-r)=0

We add all the numbers together, and all the variables

-(-1r+8)+7=0

We get rid of parentheses

1r-8+7=0

We add all the numbers together, and all the variables

r-1=0

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

r=1

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