21=1-r/5

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Solution for 21=1-r/5 equation: 



21=1-r/5

We move all terms to the left:

21-(1-r/5)=0

We add all the numbers together, and all the variables

-(-r/5+1)+21=0

We get rid of parentheses

r/5-1+21=0

We multiply all the terms by the denominator


r-1*5+21*5=0

We add all the numbers together, and all the variables

r+100=0

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

r=-100

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