{5х + 7у = 300
=> x = 50 - y, тогда
5(50 - у) + 7у = 300
=> 2y = 50 => y = 25, x = 25
х + у = 50
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{5х + 7у = 300
=> x = 50 - y, тогда
5(50 - у) + 7у = 300
=> 2y = 50 => y = 25, x = 25
х + у = 50