14 + { 4 × [ 28 + ( a + 2 ) : 6 ] - 5 } : 5 = 37
{ 4 × [ 28 + ( a + 2 ) : 6 ] - 5 } : 5 = 37 - 14
{ 4 × [ 28 + ( a + 2 ) : 6 ] - 5 } : 5 = 23
4 × [ 28 + ( a + 2 ) : 6 ] - 5 = 23 × 5
4 × [ 28 + ( a + 2 ) : 6 ] - 5 = 115
4 × [ 28 + ( a + 2 ) : 6 ] = 115 + 5
4 × [ 28 + ( a + 2 ) : 6 ] = 120
28 + ( a + 2 ) : 6 = 120 : 4
28 + ( a + 2 ) : 6 = 30
( a + 2 ) : 6 = 30 - 28
( a + 2 ) : 6 = 2
a + 2 = 2 × 6
a + 2 = 12
a = 12 - 2
a = 10
