90=-5(2+4r)

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Solution for 90=-5(2+4r) equation: 



90=-5(2+4r)

We move all terms to the left:

90-(-5(2+4r))=0

We add all the numbers together, and all the variables

-(-5(4r+2))+90=0



We calculate terms in parentheses: -(-5(4r+2)), so:

-5(4r+2)

We multiply parentheses

-20r-10

Back to the equation:

-(-20r-10)



We get rid of parentheses

20r+10+90=0

We add all the numbers together, and all the variables

20r+100=0

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

20r=-100

r=-100/20

r=-5

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