121=6-5(-3-4r)

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Solution for 121=6-5(-3-4r) equation: 



121=6-5(-3-4r)

We move all terms to the left:

121-(6-5(-3-4r))=0

We add all the numbers together, and all the variables

-(6-5(-4r-3))+121=0



We calculate terms in parentheses: -(6-5(-4r-3)), so:

6-5(-4r-3)

determiningTheFunctionDomain
-5(-4r-3)+6

We multiply parentheses

20r+15+6

We add all the numbers together, and all the variables

20r+21

Back to the equation:

-(20r+21)



We get rid of parentheses

-20r-21+121=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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