18-7=-2(-2r-8)-3r

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Solution for 18-7=-2(-2r-8)-3r equation: 



18-7=-2(-2r-8)-3r

We move all terms to the left:

18-7-(-2(-2r-8)-3r)=0

We add all the numbers together, and all the variables

-(-2(-2r-8)-3r)+11=0



We calculate terms in parentheses: -(-2(-2r-8)-3r), so:

-2(-2r-8)-3r

We add all the numbers together, and all the variables

-3r-2(-2r-8)

We multiply parentheses

-3r+4r+16

We add all the numbers together, and all the variables

r+16

Back to the equation:

-(r+16)



We get rid of parentheses

-r-16+11=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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