【Deduct】 , 【subtract】 mean to take away one quantity from another.

【Deduct】 usually is used in reference to amounts (as of costs, payments, or credits).

• The cost of your uniform will be deducted from your wages.
• Ten points will be deducted for a wrong answer.
• If you will just sign here, we will arrange for your bank to 【deduct】 your payments automatically.

【Subtract】 is used in reference to numbers or to figures obtained by a computation or calculation.

• 6 subtracted from 9 is 3.
• Mandy subtracted the date of birth from the date of death.

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