`x = -1/2 - 3/4`
`=> x= -2/4-3/4`
`=>x=-5/4`
`-------`
`x/5=5/6-(-19/30)`
`=> x/5=5/6 +19/30`
`=> x/5= 25/30+19/30`
`=>x/5= 22/15`
`=> 15x=5.22`
`=> 15x=110`
`=>x= 7,(3)`
`-------`
`x/15 = 3/5 -(-2/3)`
`=>x/15 = 3/5 +2/3`
`=>x/15= 9/15+10/15`
`=>x/15=19/15`
`=>15x=19.15`
`=>15x=285`
`=>x=285:15`
`=>x= 19`
`--------`
`-(-6)/12-x=9/48`
`=>6/12 -x=9/48`
`=>x= 1/2 - 3/16`
`=>x= 8/16-3/16`
`=>x=5/16`
`----------`
`11/8 - 13/6=85/x`
`=> -19/24=85/x`
`=> -19x=24.85`
`=>-19x= 2040`
`=>x=-2040/19`
`------`
`x+7/8=13/12`
`=>x=13/12-7/8`
`=>x= 5/24`
`------`
`x+(-6/15)=4/27`
`=>x=4/27 -(-6/15)`
`=>x=4/27 +6/15`
`=>x= 74/135`
`--------`
`x+4/6 = 5/25 -(-7/15)`
`=> x+4/6 =1/5+7/15`
`=> x+4/6 = 3/15 + 7/15`
`=> x+4/6 =2/3`
`=>x= 2/3 - 4/6`
`=>x= 4/6-4/6`
`=>x= 0`
lần sau bạn tách đi ạ;-;
a: x=-2/4-3/4=-5/4
b: =>x/5=25/30+19/30=44/30
=>x=220/30=22/3
c: =>x/15=9/15+10/15=19/15
=>x=19
d: =>1/2-x=9/48
=>x=24/48-9/48=15/48=5/16
e: =>85/x=-19/24
=>x=-2040/19
f: =>x=13/12-7/8=26/24-21/24=5/24
g: =>x=4/27+6/15=4/17+2/5=20/85+17/85=37/85
h: =>x+2/3=1/5+7/15=10/15=2/3
=>x=0