Упростите выражение ((a+3b) 2/4 (a-3b) - 4a) : 3a+9b/24a-16•a2-9b2/5a2-18ab-3b2 и найдите его значение при a=-2/3, b=7/3

((a + 3b) ²/4 (a - 3b) - 4a) : 3a + 9b/24a - 16 * a² - 9b²/5a² - 18ab - 3b² = ((a + 3b) ² / (4a - 12b - 4a) : 3 (a + 3b) / 8 (3a - 2) * (a - 3b) (a + 3b) / 5a² - 18ab - 3b² = ((a + 3b) ² / ( - 12b) * 8 (3a - 2) / 3 (a + 3b) * (a - 3b) (a + 3b) / 5a² - 18ab - 3b² = ((a + 3b) ² * 8 (3a - 2) * (a - 3b) (a + 3b)) / ( - 12b) * 3 (a + 3b) * (5a² - 18ab - 3b²) = ((a + 3b) * 2 (3a - 2) * (a - 3b) (a + 3b)) / ( - 9b) * (5a² - 18ab - 3b²) = ((a + 3b) ² * 2 (3a - 2) * (a - 3b)) / ( - 9b) * (5a² - 18ab - 3b²) = ((-2/3 + 3 * 49/9) * 2 (3 * ( - 6/3 - 2)) * ( - 2/3 - 3 * 7/3)) / ( - 9 * 7/3) * (5 * 4/9 + (18*2/3*7/3) - 3*49/9) = ((-2/3 + 49/3) * 2 (3 * ( - 4)) * ( - 2/3 - 7)) / ( - 3 * 7) * (20/9 + (18*14/9) - 49/3) = (47/3 * (-24) * (-5/3)) / ( - 21 * (28 - 127/9) = (47 * 8 * 5/3) / (-21 - 125/9) = (1880/3) / (-314/9) = (1880/3) * (9/-314) = 1880 * 9 / 3 * ( - 314) = 1880 * 3 / ( - 314) = - 940 * 3/157 = - 2820/157 = - 17 151/157.