e: =>2x+6=2x-8+14
=>6=6(nhận)
g: =>2x+2x-1=6-2x
=>4x-1=-2x+6
=>6x=7
=>x=7/6
i: =>5(5x-7)-4(9x-4)=9x-19-20x
=>25x-35-36x+16=-11x-19
=>0x=0(luôn đúng)
k: =>15(2x+1)-100-2(3x+2)=4(6x-2)
=>30x+15-100-6x-4=24x-4
=>24x-89=24x-4
=>-89=-4(loại)
f: =>6x-19=3x+5
=>3x=24
=>x=8