Respuesta :

[tex] \frac{7 3}{10} - x = 7\Leftrightarrow x = \frac{73}{10} - 7 = \frac{73}{10} - \frac{70}{10} = \frac{3}{10} [/tex]

Subtract 3/10 to make 70/10

I think it is easy enough to simplify from there.

Divide both by 10

7/1 is equal to 7