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10x + 5y = 5 + 5
10x + 5y = 10 Ec (1)
2x + y = ? Ec (2)
despejando "y" en la ecuación (2)
2x + y = ?
y = - 2x
Sustituyendo "y" en la Ecuación (1)
10x + 5y = 10
10x + 5(-2x) = 10
10x -10x =10
0x = 10
x = 10/0
x = 0