8=20-7-0.50r

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Solution for 8=20-7-0.50r equation: 



8=20-7-0.50r

We move all terms to the left:

8-(20-7-0.50r)=0

We add all the numbers together, and all the variables

-(-0.5r+13)+8=0

We get rid of parentheses

0.5r-13+8=0

We add all the numbers together, and all the variables

0.5r-5=0

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

0.5r=5

r=5/0.5

r=10

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