Solutions      (There is often more than one solution ... )

Set 1

6 3 2 = 1

6 (2 + 3) = 1

6 (3 x 2) = 1

4 x (4 2) = 8

(4 x 4) 2 = 8

(6 x 4) 4 = 20

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Set 2

(8 1) (3 x 2) = 1

(4 x 3) 8 + 2 = 6

8 4 2 = 2    and    2 x 3 = 6

(6 x 2) + (5 + 3) = 20

(5 x 2) x (6 3) = 20

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Set 3

17 9 = 8     and     8 + 5 = 13     and     13 12 = 1

(17 + 5) (12 + 9) = 1

18 12 = 6     and     9 3 = 3     and     6 + 3 = 9

(18 12) + (9 3) = 9

14 2 = 7     and     6 + 3 = 9     and     9 + 7 = 16

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Set 4

8 x = 4     and     4 1 = 3     and     4 3 = 1

((8 x ) 4) x 1 = 1

6 x = 12     and     2 x 1 = 2     and     12 2 = 10

6 + ((2 x 1) = 10

8 5 = 3     and     3 = 12     and     12 + 6 = 18

((8 5) ) + 6 = 18

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Set 5

6 5 + 1 2 = 1

(5 x 2) (6 + 3) = 1

(6 + 6) (6 3) = 9

(6 + 4) (6 6) = 9

(4 + 7) + (6 + 3) = 20

(4 x 6) (7 3) = 20

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