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y= televisor 29"
x+y=980€
y=x+400 (el televisor grande cuesta 400€ más que el pequeño)
x+x+400=980
2x=580
x=290€
televisor pequeño=290€
televisor grande=290+400=690€
29"⇒ x +400
por los dos paga 980
x + x + 400 =980
2x = 980 - 400
x = 290
rempalzando
14" = 290
29 " = 290 + 400 = 690