[tex]x+ \frac{16}{100}x- \frac{16}{100}(x+ \frac{16}{100}x)=x-16 [/tex]
[tex]x+ \frac{16x}{100}- \frac{16x}{100}- \frac{256x}{10000} =x-16[/tex]
[tex]x- \frac{16x}{625}=x-16 [/tex]
[tex]625x-16x=625x-10000[/tex]
[tex]10000=625x-625x+16x[/tex]
[tex]10000=16x[/tex]
[tex]x=10000:16[/tex]
[tex]x=625[/tex]