20=(40-2.5r)/0.5

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Solution for 20=(40-2.5r)/0.5 equation: 



20=(40-2.5r)/0.5

We move all terms to the left:

20-((40-2.5r)/0.5)=0

We add all the numbers together, and all the variables

-((-2.5r+40)/0.5)+20=0

We multiply all the terms by the denominator


-((-2.5r+40)+20*0.5)=0



We calculate terms in parentheses: -((-2.5r+40)+20*0.5), so:

(-2.5r+40)+20*0.5

We add all the numbers together, and all the variables

(-2.5r+40)+10

We get rid of parentheses

-2.5r+40+10

We add all the numbers together, and all the variables

-2.5r+50

Back to the equation:

-(-2.5r+50)



We get rid of parentheses

2.5r-50=0

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

2.5r=50

r=50/2.5

r=20

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