20=40-2.5r/2

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Solution for 20=40-2.5r/2 equation: 



20=40-2.5r/2

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

2.5r/2-40+20=0

We multiply all the terms by the denominator


2.5r-40*2+20*2=0

We add all the numbers together, and all the variables

2.5r-40=0

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

2.5r=40

r=40/2.5

r=16

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