3131=3100(1+0.25r)

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Solution for 3131=3100(1+0.25r) equation: 



3131=3100(1+0.25r)

We move all terms to the left:

3131-(3100(1+0.25r))=0

We add all the numbers together, and all the variables

-(3100(0.25r+1))+3131=0



We calculate terms in parentheses: -(3100(0.25r+1)), so:

3100(0.25r+1)

We multiply parentheses

0r+3100

We add all the numbers together, and all the variables

r+3100

Back to the equation:

-(r+3100)



We get rid of parentheses

-r-3100+3131=0

We add all the numbers together, and all the variables

-1r+31=0

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

-r=-31

r=-31/-1

r=+31

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