20000=25000-25000*r*4

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Solution for 20000=25000-25000*r*4 equation: 



20000=25000-25000r*4

We move all terms to the left:

20000-(25000-25000r*4)=0

We add all the numbers together, and all the variables

-(-25000r*4+25000)+20000=0

We get rid of parentheses

25000r*4-25000+20000=0

We add all the numbers together, and all the variables

25000r*4-5000=0

Wy multiply elements

100000r-5000=0

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

100000r=5000

r=5000/100000

r=1/20

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