Bài 2:
a: =>5x=2/3-1/2=4/6-3/6=1/6
=>x=1/30
b:=>2x+3/15-10/15=1/2
=>2x-7/15=1/2
=>2x=1/2+7/15=15/30+14/30=29/30
=>x=29/60
c: =>1/4x=-5/3-7/5=-25/15-21/15=-46/15
=>x=-46/15*4=-184/15
d: =>5/2x=7/6+3/4=14/12+9/12=23/12
=>x=23/12:5/2=23/12*2/5=46/60=23/30