Из предложенных вариантов определи тождество.
(3х – 4х + х)(у – 3) = xy – 3х
-2(у – 3) – 2 = 3y +2
3(x+ 2) – 2 = 3х + 2
by
(2020 – 2019 – 1)(у – 3) – 2 = -2
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