1. Consider the equilibrium of moments about point A to eliminate the reactions at A.
2. The moment due to the force \( F = 45 \, \text{kN} \) at D is:
\[
M_D = F \times 3 \, \text{m} = 45 \, \text{kN} \times 3 \, \text{m} = 135 \, \text{kN}\cdot\text{m}
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