790=900-550r

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Solution for 790=900-550r equation: 



790=900-550r

We move all terms to the left:

790-(900-550r)=0

We add all the numbers together, and all the variables

-(-550r+900)+790=0

We get rid of parentheses

550r-900+790=0

We add all the numbers together, and all the variables

550r-110=0

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

550r=110

r=110/550

r=1/5

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