The bending moment (in kNm units) at the mid -span location

The bending moment (in kNm units) at the mid -span location X in the beam with overhangs shown below is equal

Taking moment about B.
M_B = R_A × 2 – 20 × 3 + 10 ×1 = 0
⇒ R_A = 25 kN
Moment about X,
M_x = R_A × 1 – 20 × 2
= 25 × 1 – 20 × 2 = – 15 kNm