AUX1=SM11*$1 AUX2=SM12*$2 AUX3=SM13*$3 F1=AUX1+AUX2 F1=F1+AUX3 F1=0-F1 AUX1=SM21*$1 AUX2=SM22*$2 AUX3=SM23*$3 F2=AUX1+AUX2 F2=F2+AUX3 F2=0-F2 AUX1=SM31*$1 AUX2=SM32*$2 AUX3=SM33*$3 F3=AUX1+AUX2 F3=F3+AUX3 F3=0-F3 U1=$4*F1 U2=$5*F2 U3=$6*F3 U=U1+U2 U=U+U3 $7=U