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2y+7x =−5
5y−7x = 12
2y+7x =−5
5y−7x = 12
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Respuesta:
2y+7x=−5
+ 5y−7x = 12
__________
7y+0 =7
7y+0=7
7y=7
y =1
5y−7x=12
5×1−7×(−1)= ?12
5+7=12
Se ha cumplido el sistema
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