8.2=r+-0.5

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Solution for 8.2=r+-0.5 equation: 



8.2=r+-0.5

We move all terms to the left:

8.2-(r+-0.5)=0

We add all the numbers together, and all the variables

-(r-0.5)+8.2=0

We get rid of parentheses

-r+0.5+8.2=0

We add all the numbers together, and all the variables

-1r+8.7=0

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

-r=-8.7

r=-8.7/-1

r=8+0.7/1

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