-100=4(5+5r)

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Solution for -100=4(5+5r) equation: 



-100=4(5+5r)

We move all terms to the left:

-100-(4(5+5r))=0

We add all the numbers together, and all the variables

-(4(5r+5))-100=0



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

4(5r+5)

We multiply parentheses

20r+20

Back to the equation:

-(20r+20)



We get rid of parentheses

-20r-20-100=0

We add all the numbers together, and all the variables

-20r-120=0

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

-20r=120

r=120/-20

r=-6

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