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With negative numbers, how do we know when the negative sign indicates that it is a subtraction or it is a negative number?

This is a question from Khan Academy:
(−5+7×1)−9×5
If you calculate the equation in the parentheses which equals 2, then the equation becomes 2-9x5. At this point, would you calculate the 9x5 part as 9 x 5 then subtract 2 or -9 x 5 then add 2. I know that this isn't the greatest example since it would equal -43 regardless but there are some equations where it would change the entire equation.

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Answer:

its always a negitive number subtraction is just adding a negitive number

5-3 is 5+(-3)

(−5+7×1)−9×5

(−5+7)−45

2-45

-43

Hope This Helps!!!

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