8r-10=80-r

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Solution for 8r-10=80-r equation: 



8r-10=80-r

We move all terms to the left:

8r-10-(80-r)=0

We add all the numbers together, and all the variables

8r-(-1r+80)-10=0

We get rid of parentheses

8r+1r-80-10=0

We add all the numbers together, and all the variables

9r-90=0

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

9r=90

r=90/9

r=10

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