20х-5у-3у-6х=14х-8у=2(7х-4у)
раскроем скобки=20х-5у-3у-6х=14х-8у
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20х-5у-3у-6х=14х-8у=2(7х-4у)
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раскроем скобки=20х-5у-3у-6х=14х-8у