Respuesta :
the top answer is right, it’s 18.
15=x-3
you’d add 3 to 3 to get rid of it (because it’s -3) and add it to also 15. 15+3= 18 so x=18
15=18-3
15=x-3
you’d add 3 to 3 to get rid of it (because it’s -3) and add it to also 15. 15+3= 18 so x=18
15=18-3