Since we do not know jacksons age leave that as x. We need to set up an equation to find out Jackson's age since the equation says 2/5 of his age and she will be (so x) 20 years from now so add x - 7 = (2/5)(x + 20) 5 (x - 7) = 5 * (2/5)(x + 20) (multiply with 5 to both sides) 5x - 35 = 2x + 40 5x - 2x = 40 + 35 3x = 75 x = 25 Jackson=25 years old
