2:
a: 2x+23=15
=>2x=-8
=>x=-4
b: -5/6<x/24<-3/4
=>-20/24<x/24<-18/24
=>-20<x<-18
=>x=-19
c: x/27=-64/96
=>x/27=-2/3
=>x=-18
d: (x-2)/(-3)=(-27)/(x-2)
=>(x-2)^2=81
=>x-2=9 hoặc x-2=-9
=>x=-7 hoặc x=11
1:
a: =-8-12=-20
b: =-1000*17=-17000
c: =12*5/(-3)=-4*5=-20