6
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A third one (hopefully it's easier :)!

$$\begin{align}156+257&=-6\\752+651&=6\\103+482&=-19\\284+301&=31\\654+321&=21\\123+456&=\,?\end{align}$$

Can you find the value of the question mark?

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10
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Rule:

$abc+def= b \times c + a - e \times f - d$

$284 + 301 = 31$

$$8\times4 + 2 - 0\times1 - 3 = 31$$ Also, it works well for all the given equations.

Value of the question mark:

$-27$
As $2\times3 + 1 - 5\times6 - 4 = -27$

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  • $\begingroup$ How did you find out the pattern? $\endgroup$ – m4n0 Jul 3 '18 at 0:44

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