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Finding the unknown value (S4)

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1

1	3	–	1	2	=
	5			5

2

1	–	1	=
2		5

3

	4	–	x	=	7
	5				15

4

x	–	1	=	1
		2		4

5

	2	–	x	=	3
	5		4		20

6

	x	–	1	=	1
	4		5		20