Answer:
Step-by-step explanation:
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Answer:
my estimation is 67
Step-by-step explanation:
Hi!
-9f + 19 - 1 + f is actually -8f + 18.
To do this we add like terms, -9f and f; and 19 and -1
-9f + f is -8f
19 - 1 is 18
Therefore your answer is -8f + 18
Answer:

Step-by-step explanation:
Evaluate all the arithmetic first, and then remember absolute value equations have two possible ways to go (+ and -).
You can see how I split them on the 3rd line, later demonstrating how the 2nd one is invalid.

Therefore, the solution is 
Answer:
Correct, as 4 is the only number repeating twice