35=80-5r

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Solution for 35=80-5r equation: 



35=80-5r

We move all terms to the left:

35-(80-5r)=0

We add all the numbers together, and all the variables

-(-5r+80)+35=0

We get rid of parentheses

5r-80+35=0

We add all the numbers together, and all the variables

5r-45=0

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

5r=45

r=45/5

r=9

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