Find the volume of the solid by subtracting two volumes. the solid enclosed by the parabolic cylinders y = 1 - x, y = x

Find the volume of the solid by subtracting two volumes. the solid enclosed by the parabolic cylinders y = 1 - x², y = x² - 1 and the planes x + y + z = 2, 5x + 4y - z + 15 = 0