500=1200-100r

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Solution for 500=1200-100r equation: 



500=1200-100r

We move all terms to the left:

500-(1200-100r)=0

We add all the numbers together, and all the variables

-(-100r+1200)+500=0

We get rid of parentheses

100r-1200+500=0

We add all the numbers together, and all the variables

100r-700=0

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

100r=700

r=700/100

r=7

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