(2m + 9) * 5 + 4m = 2m * 5 + 9 * 5 + 4m = 10m + 45 + 4m = 14m + 45

(18b - 4) * 7 + 2b = 18b * 7 - 4 * 7 + 2b = 126b - 28 + 2b = 128b - 28

(4x - 11) * 4 + 18x = 4x * 4 - 11 * 4 + 18x = 16x - 44 + 18x = 34x - 44

(25a + 3) * 5 + a + 12 = 25a * 5 + 3 * 5 + a + 12 = 125a + 15 + a + 12 = 126a + 27

(4x+2)*3+2*(5x-1) = 4x * 3 + 2 * 3 + 2 * 5x + 2 * (-1) = 12x + 6 + 10x - 2 = 22x + 4

18 * (2y + 3) + 2 * (y + 6) = 18 * 2y + 18 * 3 + 2 *y + 2 * 6 = 36y+ 54 + 2y + 12 = 38y + 66

Надеюсь успел тебе помочь )