Can you solve this?

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	+		+		=	60
					=	60/3
					=	20
	+		+		=	30
20	+		+		=	30
			+		=	10
					=	10/2
					=	5
			-		=	3
		5	-		=	3
					=	2
					=	1
	+		x		=	?
1	+	20	x	4	=	?
1	+	80			=	81
Answer is : 81