4231.5=4200(1+0.25r)

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Solution for 4231.5=4200(1+0.25r) equation: 



4231.5=4200(1+0.25r)

We move all terms to the left:

4231.5-(4200(1+0.25r))=0

We add all the numbers together, and all the variables

-(4200(0.25r+1))+4231.5=0



We calculate terms in parentheses: -(4200(0.25r+1)), so:

4200(0.25r+1)

We multiply parentheses

0r+4200

We add all the numbers together, and all the variables

r+4200

Back to the equation:

-(r+4200)



We get rid of parentheses

-r-4200+4231.5=0

We add all the numbers together, and all the variables

-1r+31.5=0

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

-r=-31.5

r=-31.5/-1

r=31+0.5/1

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