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Finding the unknown value (S13)

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1

2	–	2	=
3		5

2

3	–	1	=
5		3

3

	1	–	x	=	3
	2				10

4

x	–	1	=	3
		2		10

5

	3	–	x	=	1
	4		3		12

6

	x	–	3	=	1
	3		5		15