Extract weight and multiple in SSRS-2012

SELECT[Data]from usrrpt.Expansion EX WHERE EX.Order_PK ='231503796'AND EX.FieldName_PK like'SHIPCOMMENT%'
and the data returned is as follows:
Data:
5 PLTS(STC:20 CTNS)DIM:80X71X155CM@122KG80X71X120CM@95KG X2,80X71X120CM@96KG X4,80X71X107CM@76KG80X71X109CM@86KG X 7
How do I get the sum of the weight (122 + 95 * 2 + 96 * 4 + 76 + 86 * 7)?