Bài 5:
a: =>6(x-3)-6=4(6x+9)-24
=>6x-18-6=24x+36-24
=>24x+12=6x-24
=>18x=-36
=>x=-2
b: =>5(6x+2+1)-100=8(3x-1)-2(3x+2)
=>30x+15-100=24x-8-6x-4
=>30x-85=18x-12
=>12x=73
=>x=73/12
c: =>4x+3(x-2)=12(0,5x-2,5)
=>4x+3x-6=6x-30
=>7x-6=6x-30
=>x=-24
d: =>5(2x-4)-30x=-3(6x+3)+1
=>10x-20-30x=-18x-9+1
=>-20x-20=-18x-8
=>-2x=12
=>x=-6


