hhhhhhhheeeeeeelllllllllpppppp

I can show you a couple different "ways" of doing it. (They all accomplish the same thing though.)

 

$x - \frac{80}{100} = 90 \\~\\ x=90+\frac{80}{100} \\~\\ x=\frac{454}{5}=90.8$

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$x - \frac{64}{100} = 72 \\~\\ x-0.64=72 \\~\\ x=72+0.64=72.64$

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$x - 15\% = 146.54 \\~\\ x - 0.15 = 146.54 \\~\\ x = 146.54 + 0.15 =146.69$

x - 80% = 90

what is x

 

x - 80%x = 90

20%x = 90

0.20x = 90

x =90 / 0.20

x =450

 

x - 64% =72

what is x

 

x - 64%x =72

36%x = 72

0.36x = 72

x =72 / 0.36

x = 200

 

x - 15% = 146.54

what is x

 

x - 15%x = 146.54

85%x =146.54

0.85x =146.54

x =146.54 / 0.85

x = 172.4