б) (2z+7+6t)-7+4-(22-1-5t);

б) $$(2z + 7 + 6t) \cdot 7 + 4 \cdot (2z - 1 - 5t) = 2z \cdot 7 + 7 \cdot 7 + 6t \cdot 7 + 4 \cdot 2z - 4 \cdot 1 - 4 \cdot 5t = 14z + 49 + 42t + 8z - 4 - 20t = (14z + 8z) + (42t - 20t) + (49 - 4) = 22z + 22t + 45$$ Ответ: $$22z + 22t + 45$$