# Mistake

Nicol mistake when calculate in school. Instead of add number 20 subtract it.

What is the difference between the result and the right result?

Result

x =  -40

#### Solution:

$a = n + 20 \ \\ b = n- 20 \ \\ \ \\ x = b-a = (n - 20) - (n + 20) \ \\ x= -2\cdot 20 = -40$

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