20r+80=40r-40

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Solution for 20r+80=40r-40 equation: 



20r+80=40r-40

We move all terms to the left:

20r+80-(40r-40)=0

We get rid of parentheses

20r-40r+40+80=0

We add all the numbers together, and all the variables

-20r+120=0

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

-20r=-120

r=-120/-20

r=+6

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