Ta có:4x+(6+5x)=24
=>(4x+5x)+6=24
=>9x=24-6=18
=>x=2
4x+ (6+5x)=24
4x+6+5x=24
(4x+5x)+6=24
(4x+5x)=24-6
(4x+5x)=18
9x =18
x =18:9
x = 2
4x+(6+5x)=24
4x+6+5x=24
9x+6+24
9x=24-6
9x=18
x=18/9
x=2
4x +(6+5x)=24
4x+6+5x=24
4x+5x+6=24
x.(4+5)+6=24
x.9+6=24
x.9 =24-6
x.9 =18
x =18:9
x =2