variable whose value is to be found

UNKNOWN
WordClue
TAXland or value-added
LOADweight to be carried
SEATSomething to be sat upon
STARpolar or variable
MERITvalue
PARTYmay be Communist
RODEOgathering of cattle to be branded
TOWELcloth which is used to dry something
WIDOWwoman whose spouse has died
WORTHvalue
HANDLEpart of device designed to be held
WEALTHabundance of value
MISSILEair-to-air or air-to-ground
VOUCHERreceipt or bond with a certain value
CREDITORperson to whom a debt is owed
ADVANTAGEvalue, edge
APPRAISERsets property value
CHANGEABLEvariable
LUMBERJACKperson whose work is to fell trees
COEFFICIENTnumber just before a variable
CHANGEABLEvariable
DIFFERENCEvariety, diversity