10r+40=20r-20

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Solution for 10r+40=20r-20 equation: 



10r+40=20r-20

We move all terms to the left:

10r+40-(20r-20)=0

We get rid of parentheses

10r-20r+20+40=0

We add all the numbers together, and all the variables

-10r+60=0

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

-10r=-60

r=-60/-10

r=+6

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