descontarían
-they would deduct
The word descontarían is the conditional form of descontar in the third person plural.
See the full descontar conjugation

descontar

En caso de que esto suceda, las cantidades a pagar por el Estado para descargar a BE de estas responsabilidades que superen el cálculo original se descontarían del umbral de 1629000000 GBP mencionado anteriormente, sin que se alterara dicho umbral.
Should this happen, amounts to be paid by the State to discharge BE from these liabilities in excess of the original estimate would be counted against the GBP 1629000000 threshold mentioned above, without that threshold being altered.
A los países en la zona de transición entre los dos umbrales no se les aplicaría el ajuste por bajos ingresos per cápita ni tendrían que contribuir a él, es decir, ni se les descontarían puntos ni se les agregarían puntos.
Countries in the transition zone between the two thresholds would neither benefit from nor contribute to the low per capita income adjustment—i.e., neither jettison nor pick up points.
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