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Finding the unknown value (S4)

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1

2	4	–	1	1	=
	5			3

2

3	–	1	=
4		5

3

	5	–	x	=	1
	6				6

4

x	–	3	=	3
		5		20

5

	1	–	x	=	1
	3		6		6

6

	x	–	1	=	1
	5		6		30