90=-5(2+r)

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Solution for 90=-5(2+r) equation: 



90=-5(2+r)

We move all terms to the left:

90-(-5(2+r))=0

We add all the numbers together, and all the variables

-(-5(r+2))+90=0



We calculate terms in parentheses: -(-5(r+2)), so:

-5(r+2)

We multiply parentheses

-5r-10

Back to the equation:

-(-5r-10)



We get rid of parentheses

5r+10+90=0

We add all the numbers together, and all the variables

5r+100=0

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

5r=-100

r=-100/5

r=-20

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