Respuesta :

15 = 5/7x
7/5 7/5

21 = x
wikk
15 = 5/7x

To simplify, you can either divide both sides by 5/7, which is roughly 0.71, or you can multiply both sides by the inverse of 5/7, which is 7/5 (or 1.4).

15 * (7/5) = 5/7(7/5)x

21 = x