80=100-r*100

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Solution for 80=100-r*100 equation: 



80=100-r*100

We move all terms to the left:

80-(100-r*100)=0

We add all the numbers together, and all the variables

-(-r*100+100)+80=0

We get rid of parentheses

r*100-100+80=0

We add all the numbers together, and all the variables

r*100-20=0

Wy multiply elements

100r-20=0

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

100r=20

r=20/100

r=1/5

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