10	x	4	-	6	+	13	=	47
+		x		-		+
3	x	8	+	5	+	1	=	30
x		+		x		+
16	-	11	x	9	-	12	=	-95
+		+		-		-
15	+	2	-	7	x	14	=	-81
=		=		=		=
73		45		-46		12