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Think of x as a number

lets say that x is 5

so 8+5=13

5+8=13

however

5-8= -3 because i am taking away -8 from 5

8-5= 3 because i am taking away 5 from 8

in subtraction you need to be aware of the minus sign and what number to in front of it.

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Q: Why is it correct to write the sum of a number and 8 as either x plus 8 or 8 plus x but the difference of number and 8 must be written as x-8 and not 8-x?
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