September 2021 0 2 Report
Укажите равенства, верные при всех значениях переменных. 4a+6b-4a+b=8a+7b
9x-4-4y-9x+5=1-4y
6m-7n-3m+2n=3m-5n
19c+3d-19d-2c=3d-2c
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