Làm hộ e bài 3.

1)280-(x+17)=5628:28

=>280 - 17- x =201

=>263 -x=201

=>x=263-201

=>x=62

2)75+3×(4x-7)=150

=>12x-21=150-75

=>12x-21=75

=>12x=75+21

=>12x=96

=>x=96:12

=>x=8

3)192:(2x-2)=16

=>2x-2=192:16

=>2x-2=12

 =>2x=12+2

=>2x=14

=>x=14:2

=>x=7

4)35.(2x-3)=9+ 2×48

=>70x-105=9+96

=>70x=105+105

=>70x=210

=>x=210:70

=>x=30

5)5x-32+x=22

=>5x+1x=22+32

=>(5+1)x=54

=>6x   = 54

=>x=54:6

=>x=9

6)5x-17-x=43

=>5x-1x=43+17

=>(5-1)x=60

=>4x=60

=>x=60:4

=>x=15