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Finding the unknown value (S11)

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1

1	3	–	2	=
	5		3

2

5	–	1	=
6		5

3

	1	–	x	=	1
	2				3

4

x	–	1	=	5
		4		12

5

	3	–	x	=	11
	4		5		20

6

	x	–	2	=	1
	2		5		10