Question

cuanto es:

x + 8 = 8 - (x - 9)

Answer 1

X + 8 = 8 - (X - 9)
X = -X + 9
X + X = 9
2 X = 9
x = 9/2

Answer 2

La ecuación que tienes es:
x + 8 = 8 - (x - 9)
x + 8 = 8 - x + 9
x + 8 = - x + 8 + 9
x + 8 = - x + 17
x + x = 17 - 8
2x = 9
x = 9/2

Respuesta.
x = 9/2


COMPROBAMOS LA SOLUCIÓN
x + 8 = 8 - (x - 9)
9/2 + 8 = 8 - (9/2 - 9)
(2 * 8 + 9)/2 = 8 - 9/2 + 9
(16 + 9)/2 = - 9/2 + 8 + 9
25/2 = - 9/2 + 17
25/2 = (2 * 17 - 9)/2
25/2 = (34 - 9)/2
25/2 = 25/2

La solución es correcta!