100=200-10r

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Solution for 100=200-10r equation: 



100=200-10r

We move all terms to the left:

100-(200-10r)=0

We add all the numbers together, and all the variables

-(-10r+200)+100=0

We get rid of parentheses

10r-200+100=0

We add all the numbers together, and all the variables

10r-100=0

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

10r=100

r=100/10

r=10

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