Let the required number be x.
According to question:
When x is added to -26 we get 14.
Therefore,
x + (-26) = 14
x - 26 = 14
x = 14 + 26 = 40.
So, 40 must be added to -26 to get 14.
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-40
26 because all of the other numbers are added from 2. for example, 14+2=16, and 16+2=18
4
26
-2x - 14 = 26 -2x = 26 + 14 x = -40/2 x = -20