5:
a: =>7/4x=-4/5-3/2=-8/10-15/10=-23/10
=>x=-23/10:7/4=-23/10*4/7=-92/70=-46/35
b: x+1/2=2^5:2^3=4
=>x=4-1/2=7/2
c: 5x-7=3x+9
=>2x=16
=>x=8
d: =>x+1/2=2/5 hoặc x+1/2=-2/5
=>x=2/5-1/2=4/10-5/10=-1/10 hoặc x=-2/5-1/2=-4/10-5/10=-9/10
e: =>|3x-1|-5+6=4
=>|3x-1|=3
=>3x-1=3 hoặc 3x-1=-3
=>x=-2/3 hoặc x=4/3
h: =>5^-1*5^2x=5^3
=>2x-1=3
=>2x=4
=>x=2