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2x+y=10 ec (1)
3x-y=25 ec(2)
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5x = 35
x = 35/5
x= 7
remplazamos x en ec(1)
2x+y=10 ec (1)
2(7) + y = 10
14 + y = 10
y = 10-14
y = -4
saludos