Помогите решить.
Укажите равенства, верные при всех значениях переменных.


12a+5b-12b-a=5b-a

3x+2y-4-3x-4=2y-8

m-5n+8m+5n-1=9m-10n-1

2c+5d-3c-4d=d-c
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