[( b+789:3 ) ×8 - 1868] ×6 = 2000-2548:7-1980:9
[( b+263 ) × 8 - 1868] ×6 = 2000 - 364 - 220
[( b+263 ) × 8 - 1868] ×6 = 1.416
[( b+263 ) × 8 - 1868 ] = 1416 : 6
[ ( b+263 ) × 8 - 1868 ] = 236
( b + 263) × 8 = 236+ 1868
(b + 263) × 8 = 2104
b+263 = 2104:8
b+263 = 263
b= 263 - 263
b = 0
