x-20% = 63719,24 how to get X?

X - 20% = 63719,24 How to get X?  You should have written it like this:

 

X - 20%X =63,719.24, solve for X

0.80X = 63,719.24 divide both sides by 0.80

X = 63,719.24 / 0.80

X = 79,649.05