-12=-2(2+r)+r

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Solution for -12=-2(2+r)+r equation: 



-12=-2(2+r)+r

We move all terms to the left:

-12-(-2(2+r)+r)=0

We add all the numbers together, and all the variables

-(-2(r+2)+r)-12=0



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

-2(r+2)+r

We add all the numbers together, and all the variables

r-2(r+2)

We multiply parentheses

r-2r-4

We add all the numbers together, and all the variables

-1r-4

Back to the equation:

-(-1r-4)



We get rid of parentheses

1r+4-12=0

We add all the numbers together, and all the variables

r-8=0

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

r=8

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