Решите систему уравнений методом сложения
{4x-y=20
4x+y=12
Смотреть ответ ShirokovP ShirokovP 4x - y = 20
4x + y = 12
------------------ + сложим
8x = 32
x = 4

y = 12 - 4x = 12 - 16 = - 4 

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