20=2(40-2.5r)

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Solution for 20=2(40-2.5r) equation: 



20=2(40-2.5r)

We move all terms to the left:

20-(2(40-2.5r))=0

We add all the numbers together, and all the variables

-(2(-2.5r+40))+20=0



We calculate terms in parentheses: -(2(-2.5r+40)), so:

2(-2.5r+40)

We multiply parentheses

-4r+80

Back to the equation:

-(-4r+80)



We get rid of parentheses

4r-80+20=0

We add all the numbers together, and all the variables

4r-60=0

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

4r=60

r=60/4

r=15

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