d: =>x(x-1/7)=0
=>x=0 hoặc x=1/7
l: =>|x+3/4|=1/3
=>x+3/4=1/3 hoặc x+3/4=-1/3
=>x=-5/12 hoặc x=-13/12
e: =>1/4:x=2/5-3/4=8/20-15/20=-7/20
=>x=-1/4:7/20=-1/4*20/7=-5/7
t: =>2x+3=5 hoặc 2x+3=-5
=>x=-4 hoặc x=1
r: =>x=(-2/3)^5:(-2/3)^2=(-2/3)^3=-8/27
(x-1/2)^3=1/27
=>x-1/2=1/3
=>x=5/6