( 4 ) x 7 = 28
          
(    ) x 3 = 18
          
(    ) x 3 = 9
          
3 x (    ) = 21
          
6 x (    ) = 12
          
6 x (    ) = 42
          
4 x (    ) = 16
          
4 x (    ) = 28
          
4 x (    ) = 12
          
3 x (    ) = 15
          
(    ) x 6 = 12
          
3 x (    ) = 18
          
(    ) x 5 = 20
          
4 x (    ) = 24
          
          +[    ]

7 x (    ) = 21
          
(    ) x 4 = 24
          
(    ) x 7 = 14
          
(    ) x 4 = 28
          
5 x (    ) = 20
          
(    ) x 2 = 14
          
(    ) x 5 = 15
          
(    ) x 7 = 35
          
(    ) x 3 = 12
          
(    ) x 7 = 42
          
(    ) x 6 = 24
          
2 x (    ) = 12
          
(    ) x 2 = 6
          
2 x (    ) = 12
          
          +[    ]

(    ) x 4 = 16
          
2 x (    ) = 14
          
(    ) x 6 = 24
          
6 x (    ) = 42
          
(    ) x 6 = 18
          
(    ) x 6 = 42
          
(    ) x 7 = 35
          
5 x (    ) = 25
          
(    ) x 4 = 12
          
(    ) x 6 = 36
          
3 x (    ) = 9
          
(    ) x 6 = 36
          
(    ) x 5 = 20
          
(    ) x 6 = 42
          
          +[    ]

7 x (    ) = 28
          
(    ) x 4 = 28
          
(    ) x 7 = 21
          
4 x (    ) = 28
          
(    ) x 2 = 8
          
6 x (    ) = 30
          
2 x (    ) = 6
          
7 x (    ) = 42
          
7 x (    ) = 21
          
7 x (    ) = 42
          
3 x (    ) = 12
          
7 x (    ) = 42
          
(    ) x 2 = 8
          
(    ) x 2 = 14
          
          +[    ]

  ++[[       ]]