Respuesta :
Step-by-step explanation:
12x + 9x - 3 = 3(2x + 14)
12x + 9x - 3 = 6x + 42
21x - 3 = 6x + 42
21x - 6x = 42 + 3
15x = 45
15x/15 = 45/15
x = 3
Step-by-step explanation:
12x + 9x - 3 = 3(2x + 14)
12x + 9x - 3 = 6x + 42
21x - 3 = 6x + 42
21x - 6x = 42 + 3
15x = 45
15x/15 = 45/15
x = 3