20=-10(6+r)

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Solution for 20=-10(6+r) equation: 



20=-10(6+r)

We move all terms to the left:

20-(-10(6+r))=0

We add all the numbers together, and all the variables

-(-10(r+6))+20=0



We calculate terms in parentheses: -(-10(r+6)), so:

-10(r+6)

We multiply parentheses

-10r-60

Back to the equation:

-(-10r-60)



We get rid of parentheses

10r+60+20=0

We add all the numbers together, and all the variables

10r+80=0

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

10r=-80

r=-80/10

r=-8

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