Приведите подобные слагаемые:
1)7а + 4а - 7 + 5 - 14а
2)5х - 13у - 17х + 8у - 9х
3)- 3с - 7d + 14c - 6y + 11x
4) 15y - 7x - 4x - 6y + 11x
Помогите пожалуйста!!!!................ ❤️​
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