Respuesta :

Step-by-step explanation:

(3x + 5y - 7r)/(z + t) = 9p

3x + 5y - 7r = 9p(z + t)

3x + 5y - 7r = 9pz + 9pt

3x = 9pz + 9pt - 5y + 7r

x = (9pz + 9pt -5y + 7r)/3