8r+20-9r=64+r-4r

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Solution for 8r+20-9r=64+r-4r equation: 



8r+20-9r=64+r-4r

We move all terms to the left:

8r+20-9r-(64+r-4r)=0

We add all the numbers together, and all the variables

8r-9r-(-3r+64)+20=0

We add all the numbers together, and all the variables

-1r-(-3r+64)+20=0

We get rid of parentheses

-1r+3r-64+20=0

We add all the numbers together, and all the variables

2r-44=0

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

2r=44

r=44/2

r=22

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