-0.4=-0.4(r+19)

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Solution for -0.4=-0.4(r+19) equation: 



-0.4=-0.4(r+19)

We move all terms to the left:

-0.4-(-0.4(r+19))=0



We calculate terms in parentheses: -(-0.4(r+19)), so:

-0.4(r+19)

We multiply parentheses

-0.4r-7.6

Back to the equation:

-(-0.4r-7.6)



We get rid of parentheses

0.4r+7.6-0.4=0

We add all the numbers together, and all the variables

0.4r+7.2=0

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

0.4r=-7.2

r=-7.2/0.4

r=-18

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