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y = 50 - 2x multiplicando por 5
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-5y = 30 - 4x
5y = 250 - 10x sumando ambos eliminamos y
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0 = 280 - 14x ordenando
14x = 280
x = 20 sustituyendo este valor
y = 50 - 2(20)
y = 10
luego X=20 y Y=10
nos piden 5(x+y)
5(20+10) = 5(30) = 150 respuesta