-3r-4=8r-9r-16

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Solution for -3r-4=8r-9r-16 equation: 



-3r-4=8r-9r-16

We move all terms to the left:

-3r-4-(8r-9r-16)=0

We add all the numbers together, and all the variables

-3r-(-1r-16)-4=0

We get rid of parentheses

-3r+1r+16-4=0

We add all the numbers together, and all the variables

-2r+12=0

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

-2r=-12

r=-12/-2

r=+6

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