-78:

(20-?=-176); ?= 196

196/2=98

20-98= -78 and -176+98=-78for any arithmetic series -- one in which successive terms differ by a constant amount -- you can find the middle term by averaging the first and last terms. This example is an arithmetic series because the difference between consecutive terms is 4

so...

[20 + (-176)]/2 = -156/2 = -78

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