200=-8(r-10)

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Solution for 200=-8(r-10) equation: 



200=-8(r-10)

We move all terms to the left:

200-(-8(r-10))=0



We calculate terms in parentheses: -(-8(r-10)), so:

-8(r-10)

We multiply parentheses

-8r+80

Back to the equation:

-(-8r+80)



We get rid of parentheses

8r-80+200=0

We add all the numbers together, and all the variables

8r+120=0

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

8r=-120

r=-120/8

r=-15

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