100=-r

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Solution for 100=-r equation: 



100=-r

We move all terms to the left:

100-(-r)=0

We add all the numbers together, and all the variables

-(-1r)+100=0

We get rid of parentheses

1r+100=0

We add all the numbers together, and all the variables

r+100=0

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

r=-100

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