Tìm x: 9/2 - [2/3-(x+7/4)]=-5/4

92−23−x+74=−54

23−x+74 =92−−54

23−x+74 =92+54

23−x+74 =234

x+74 =23−234

x+74=8−6912

x+74=−6112

x=−6112−74

x=−6112−2112

x=−8212

x=−416.

Vậy x=−416.