Реши систему уравнений { 5x + y = 20 2x − y = 1 { 4x + 3y = 5 x − y = 3 { 2(x + 3y) + 9 = x + 6 3(x − 2y) = x + 30 { 7x 3 − y 9 = 4 8x 5 − y 30 = 3 СРОЧНО
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