a ) 5x - 32 = 48
5x = 48 + 32
5x = 80
x = 80 : 5
x = 16
b ) 215 - ( 2x + 143 ) = 16
( 2x + 143 ) = 215 - 16
( 2x + 143 ) = 199
2x = 199 -143
2x = 56
x = 56 : 2
x = 28
bài c hình như sai đề rồi bạn
a, 5x-32=48
5x=48+32=80
x=80/5=16
b,
a) 5x-32=48
=>5x=80
=>x=16
b)215-(2x+143)=16
=>2x+143=199
=>2x=56
=>x=28
c)31-5x=102
=>5x=-71
=>x=-71/5