Respuesta :

ghostface1
X = 36/5
Or x = 7.2


21 + x = 6x - 15
21 = 6x - 15 - x
21 = 5x - 15
21 + 15 = 5x
36 = 5x
36/5 = x
chlobug725
7+x/3 = 2x-5

multiply both sides by 3

21+x =6x-15

move the 6

21+x-6x = -15

move the 21

x-6x = -15-21

combine like terms

-5x = -15-21

divide both sides:

-5x = -36


answer: x = 36/5