Answer:
The question is kinda funny. I think the graph isn't correct cos a and b coordinate ain't right
Answer: -21
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You need to add a -1
We can find this by setting up the equation like so
x + (-6) + 12 + 15 / 4 = 5
x + 21 = 20
x = 20 -21
x = -1
Now if we insert -1 where x is located in the equation, you will get a means of 5
