Ответ:
6у-20=2(5у-10) -4у
6у-20=10у-20-4у
6у=10у-4у
6у=6у
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Ответ:
6у-20=2(5у-10) -4у
6у-20=10у-20-4у
6у=10у-4у
6у=6у