Найди корни уравнений: x•60+260=800; 900-y•90=90; 450+c÷8=500; 7200÷d+3100=4000

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Математика: Найди корни уравнений: x•60+260=800; 900-y•90=90; 450+c÷8=500; 7200÷d+3100=4000

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Найди корни уравнений: x•60+260=800; 900-y•90=90; 450+c÷8=500; 7200÷d+3100=4000

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