-12=-4(r+19)-12=-4(r+19)

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Solution for -12=-4(r+19)-12=-4(r+19) equation: 



-12=-4(r+19)-12=-4(r+19)

We move all terms to the left:

-12-(-4(r+19)-12)=0



We calculate terms in parentheses: -(-4(r+19)-12), so:

-4(r+19)-12

We multiply parentheses

-4r-76-12

We add all the numbers together, and all the variables

-4r-88

Back to the equation:

-(-4r-88)



We get rid of parentheses

4r+88-12=0

We add all the numbers together, and all the variables

4r+76=0

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

4r=-76

r=-76/4

r=-19

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