Solve the following equation. Then place the correct number in the box provided.

8 + x = 13 + 2x

X =

8 + x - 8 = 13 + 2x - 8

The 8 cancels on the left

x - 2x = 13 + 2x - 8 - 2x

The 2x cancels on the right

x - 2x = 13 - 8

Do the calculation to find

- x = 5

- x. (-1) = 5. (-1)

Times by - 1 to cancel the negative sign because you arises to find x and not - x

You finally get x = - 5