(4r+1)=(9r-1)

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Solution for (4r+1)=(9r-1) equation: 



(4r+1)=(9r-1)

We move all terms to the left:

(4r+1)-((9r-1))=0

We get rid of parentheses

4r-((9r-1))+1=0



We calculate terms in parentheses: -((9r-1)), so:

(9r-1)

We get rid of parentheses

9r-1

Back to the equation:

-(9r-1)



We get rid of parentheses

4r-9r+1+1=0

We add all the numbers together, and all the variables

-5r+2=0

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

-5r=-2

r=-2/-5

r=2/5

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