-4-9=-8r-1

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Solution for -4-9=-8r-1 equation: 



-4-9=-8r-1

We move all terms to the left:

-4-9-(-8r-1)=0

We add all the numbers together, and all the variables

-(-8r-1)-13=0

We get rid of parentheses

8r+1-13=0

We add all the numbers together, and all the variables

8r-12=0

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

8r=12

r=12/8

r=1+1/2

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