5 kN M=7 kN·m
A
C
B
6 kN
4 m
3 m
Assuming the reactions at the support as positive, I planted the sum of moments with respect to point A, positive counterclockwise.
For each load, precede the sign (+,- or N/A) as appropriate.
Precede each load with its lever arm, if this is zero or not applicable select N/A.
?M<sub>A</sub> =
Sign - Variable - Distance
[Select]
R<sub>Ax</sub> [Select]
[Select]
R<sub>Ay</sub> [Select]
[Select]
M<sub>A</sub> [Select]
[Select]
(5kN force) [Select]
[Select]
(6kN force) [Select]
[Select]
(Moment of 7 kN·m) [Select]
=0
