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Finding the unknown value (S40)

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1

1	2	–	1	2	=
	3			4

2

2	–	1	=
5		3

3

	5	–	x	=	1
	6				3

4

x	–	1	=	7
		6		30

5

	1	–	x	=	1
	5		6		30

6

	x	–	1	=	5
	3		4		12