x+2=6 则x=4 150（x+12）=240x 则x=20 2x:3=6:5 则x=9/5 5y+8y=12 则y=1x-2=6 则x=8 2x+3=x-1 则x=-4 6x-6=9x 则x=-2 8x-2=7x-2 则x=42x+4x=0 则x=0 3x-4+2x=4x-3 则x=1 7x-6=-5x 则x=3 2y=9 则y=2/9x/2=x+6 则x=12 ...