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Finding the unknown value (S16)

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1

1	4	–	1	=
	5		3

2

1	–	1	=
4		5

3

	2	–	x	=	7
	5				30

4

x	–	1	=	1
		3		2

5

	5	–	x	=	1
	6		2		3

6

	x	–	1	=	1
	4		5		20