Make 2x the only variable on the left side of the equation. Do that by taking 3 and 5 to the left. Note: if you move/transpose anynumberthesignmustchange.
2x = 18+5-3
2x=20
Divide both sides of the equation by 2 to make x the only variable left.
As the ratio of your shadow to your height is 2:1 assuming the flagpole would form a similar triangle the shadow is twice the height of the pole meaning the pole is 14 feet tall
