8r-9=9r-4

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Solution for 8r-9=9r-4 equation: 



8r-9=9r-4

We move all terms to the left:

8r-9-(9r-4)=0

We get rid of parentheses

8r-9r+4-9=0

We add all the numbers together, and all the variables

-1r-5=0

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

-r=5

r=5/-1

r=-5

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