Only solutions to quadratic equations

4x² - 12x + 9 = 0 with the only solution as x = 3 / 2

4x² - 20x + 25 = 0 with the only solution as x = 5 / 2

9x² - 30x + 25 = 0 with the only solution as x = 5 / 3

9x² - 12x + 4 = 0 with the only solution as x​​​​​​​ = 2 / 3

25x² - 20x + 4 = 0 with the only solution as x​​​​​​​ = 2 / 5

25x² - 30x + 9 = 0 with the only solution as x​​​​​​​ = 3 / 5