Translation is specified a a vector (x, y), where x is the distance moved is the horizontal direction and y is the distance moved in the vertical direction.
For horizontal movement, the y value is zero. A positive x moves the shape to the right, negative moves it to the left.
In the diagram below, click the button labelled (5, 0) to move the shape 5 units to the right. Then press the reset button to set it back to its original position.
Then try clicking the button labelled (-3, 0) to move the shape 3 units to the left.