Since the beam is simply supported at A and B, we can use the equations of equilibrium to find the reactions.
Summing the moments about point A, we get:
$M_A = 0 = -R_B * 6m + 20kN * 3m + 30kN * 2m$
Solving for $R_B$, we get $R_B = 20kN$.
Summing the forces
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