When solving the equation 9x=27, pete said the first thing he needed to do was add 9 to each side. was he correct? why or why not? (dude pls i feel like i’m going to die from asphyxiation over this)

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?