-99.45=3.9r+2(5.4r+6.87)

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Solution for -99.45=3.9r+2(5.4r+6.87) equation: 



-99.45=3.9r+2(5.4r+6.87)

We move all terms to the left:

-99.45-(3.9r+2(5.4r+6.87))=0



We calculate terms in parentheses: -(3.9r+2(5.4r+6.87)), so:

3.9r+2(5.4r+6.87)

We multiply parentheses

3.9r+10r+13.74

We add all the numbers together, and all the variables

13.9r+13.74

Back to the equation:

-(13.9r+13.74)



We get rid of parentheses

-13.9r-13.74-99.45=0

We add all the numbers together, and all the variables

-13.9r-113.19=0

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

-13.9r=113.19

r=113.19/-13.9

r=-8+1/6.9849246231156

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