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correa: x
hebilla: x - 4
RESOLUCIÓN:
correa + hebilla = $24
x + (x - 4) = 24
x + x - 4 = 24
2x - 4 = 24
2x = 24 + 4
2x = 28
x = 28/2
x = 14
correa: x = 14
hebilla: x - 4 = 14 - 4 = 10
RESPUESTA:
La hebilla costaría $10.