Solve the Equation: Finding the Missing Number in (?)+(-2)=13

Question

Solve the following problem:

$(?)+(-2)=13$

00:00 Complete the missing

00:03 Start from point (13) on the axis in the positive direction (right)

00:08 The number is directed, and negative

00:11 Let's isolate the unknown

00:14 Therefore add 2 to 13, jump 2 in the positive direction (right)

00:24 And this is the solution to the question

Let's locate the number 13 on the number line.

Since zero is greater than negative 2, we'll move two steps to the right from the number 13.

The number we've reached is 15:

$15$