433 - ( 15x +70) = 333
15x +70 = 433-333
15x+70 = 100
15x = 100 -70
15x = 30
x = 30:15
x= 2
=> x =2
tick nhé ha
433 - [ 15x + 70 ] = 333
[ 15x + 70 ] =433-333
15x + 70 =100
15x=100-70
15x=30
x=30:15
x=2
15x+70 = 433-33
15x+70 = 400
15x= 400+70
15x= 470
x=470 : 15
x= 31,(3)