The problem is showing a uniformly distributed load of 50 kN/m acting over the first 9 meters of the beam. It's total load (resultant of the distributted load, which is the 'area' of the rectangle, or (50)9 = 450 kN) acts at its cg 4.5 m from the left end. Thus, when determining reactions, it can be treated as a single concentrated point load of 450 kN acting 4.5 m from the left end. You incorrectly divided that total load by 2, but showed its location correctly.
Then the problem shows a separate 200 kN concentrated point load acting at the center of the beam 9 m from the left. Don't ignore it.
Finally, the problem shows a separate triangularly distributed load that varies from 50 kN/m to 0 kN/m acting over the right half of the beam. It's resultant equivalent concentrated load is found by calculating the 'area' of that triangle and placing that load at the cg of the triangle. You correctly located that load as 12 m from the left end, but its value is wrong.