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Finding the unknown value (S36)

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1

1	1	–	4	=
	6		2

2

4	–	1	=
5		2

3

	1	–	x	=	1
	5				30

4

x	–	2	=	2
		3		15

5

	3	–	x	=	5
	4		7		28

6

	x	–	2	=	13
	4		7		28