Объяснение:
2) 7р – 2(3р - 1) = 7р – 6p + 2 = p + 2;
3) 2(3x – 8) – 5(2x + 7) = 6x - 16 - 10x - 35 = -4x - 51;
4) 3(5m - 7) - (15m - 2) = 15m - 21 - 15m + 2 = -19