Ref. Fig. 3.15(a),

 

Resultant of A Number Of Forces 1” = C

 

Resultant of A Number Of Forces 2” = C

 

The resultant,

 

Resultant of A Number Of Forces 3” = C

 

In this case, we consider all anticlockwise moments as a positive value and all the clockwise moments as the negative value. However, initially, we did not know it that Rd is in the clockwise or anticlockwise moment. Thus the algebraic signs help to determine it.

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