10=-2(r+-10)

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Solution for 10=-2(r+-10) equation: 



10=-2(r+-10)

We move all terms to the left:

10-(-2(r+-10))=0

We add all the numbers together, and all the variables

-(-2(r-10))+10=0



We calculate terms in parentheses: -(-2(r-10)), so:

-2(r-10)

We multiply parentheses

-2r+20

Back to the equation:

-(-2r+20)



We get rid of parentheses

2r-20+10=0

We add all the numbers together, and all the variables

2r-10=0

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

2r=10

r=10/2

r=5

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