Respuesta :

5x * 4= 180

4 is being multiplied to 5x, so you would divide it into both sides. 

5x * 4 (÷4)= 180 (÷4)

5x= 45

Divide both sides by 5. 

5x (÷5)= 45 (÷5)

x=9

I hope this helps!
~kaikers