[ 40 x ( a : 8 - 32 ) x 450 : 1 - 1990 ] : 2 = 3 805
40 x ( a : 8 - 32 ) x 450 - 1990 = 3 805 x 2
40 x ( a : 8 - 32 ) x 450 = 7610+1990
( a : 8 - 32 ) x 450 =9600:40:450
a : 8 - 32 =96/4*45
( a : 8 - 32 ) =8/15
a : 8 =8/15+32
a : 8 =488/15
a =3904/15
