100=25r+400

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Solution for 100=25r+400 equation: 



100=25r+400

We move all terms to the left:

100-(25r+400)=0

We get rid of parentheses

-25r-400+100=0

We add all the numbers together, and all the variables

-25r-300=0

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

-25r=300

r=300/-25

r=-12

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