Решите систему уравнений методом алгебраического сложения: а) 2х+11у=15 и 10х-11у=9 б) 9у+13х=35 и 29у-13х=3 в) 3х-6у=12 и 3х+5у=100 г)-3х+5у=-11 и 8х+5у=11

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