2a+6aв-5в-3а-4е
а²+2ав+3в²-3а²-4ав+в²+2а²-³ав+4в² =
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2a+6aв-5в-3а-4е
а²+2ав+3в²-3а²-4ав+в²+2а²-³ав+4в² =