Помогите пожалуйста упростить выражения 15x+9x; 69m-m; 7k+23k; 15y-6y; 27a-24a; 18n-n; 7b+15b-2b; 20c-7c-5c+5; z+16z-z; 7a+6y+3a+2y; 5x-3+x; 8y+2y-5+y. Очень надо до понедельника!
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