diff --git a/calculate.go b/calculate.go
index 3c50b24..6233cc7 100644
--- a/calculate.go
+++ b/calculate.go
@@ -193,13 +193,6 @@ func (operation *Operation) inexactSolution () (solution float64, err error) {
 		}
 		
 	case OpcodeSubtract:
-		if len(operation.operands) == 1 {
-			solution, err = operation.operands[0].InexactSolution()
-			solution *= -1
-			if err != nil { return }
-			break
-		}
-	
 		for index, operand := range operation.operands {
 			subSolution, err = operand.InexactSolution()
 			if err != nil { return }