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/0.5+40)+20=0

We get rid of parentheses

2.5r/0.5-40+20=0

We multiply all the terms by the denominator


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

We add all the numbers together, and all the variables

2.5r-10=0

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

2.5r=10

r=10/2.5

r=4

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