In order to subtract fractions, you need the denominators (bottom number) to be the same.

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(x + 9)(x + 12) = 0
Expanding the brackets, we get:
-10 is less than -5 because negative numbers are farther from 0. Same applies to -4 and -20.
Answer: raise 2 to the number of days, and then multiply this value by 3.
Step-by-step explanation: