134 - 5. ( x + 4 ) = 34
5 . ( x + 4 ) = 134 - 34
5 . ( x + 4 ) = 100
( x + 4 ) = 100: 5
( x + 4 ) = 20
x = 20 - 4
x = 16
134 - 5(x+4) = 34
=> 134 - 5x - 20 = 34
=> 114 - 5x = 34
=> 5x = 114 - 34
=> 5x = 80
=> x= 16
5(x+4) = 134-34
5(x+4) = 100
(x+4) = 100 : 5
x+4 = 20
x = 20-4
x = 16
134-5.(x+4)=34
<=>134-5x-20=34
<=>114-5x=34
<=>5x=80
<=>x=16
vậy x=16