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tlug: C-Shell Script

tlug note from Venkatesh RAGHAVAN <>
I am trying to use the 'expr' function in my shell script to calculate
to variables. My Shell script statement looks like below;

E_COORD=`expr \($E-$W\)\*\)\*\($X-1)\)/$COL+$W`
N_COORD=`expr $N-\(\($N-$S\)\*\($Y-1)/$ROWS\)`

I am getting an error message which says expr:non-numeric expression.
Can any one please tell me what is wrong with using the expr function.
Thanks in advance 
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