1/4x-1/2=3/4;7x-5/4=3/8；2x-1/6=5x+1/8；1/2x-7=9x-2/6；1/5x-1/2

1/4x-1/2=3/41/4X=3/4+1/21/4X=5/4X=5/4*4X=57x-5/4=3/87X=3/8+5/47X=13/8X=(13/8)/7X=13/562x-1/6=5x+1/85X-2X=-1/6-1/83X=-7/24X=(-7/24)/3X=-7/721/2x-7=9x-2/69X-1/2X=-7+2/617/2X=-20/3X=(-20/3)/(17/2)X=(-20/3)*(2/17)X=-40/511/5x-1/2（3-2x）=11/5X-1/2*3+1/2*2x=11/5X+X-3/2=16/5X=1+3/26/5X=5/2X=(5/2)*(5/6)X=25/122x+1/3-5x-1=12X-5X=1+1-1/3-3X=5/3X=(5/3)*(-1/3)X=-5/9