解方程:y-(y+1)/2=2-(y+2)/510y-5y-5=20-2y-4
y=3
2.解方程:1/2(2x+5)=4x+3/4-2-3x/8
4(2x+5)=32x+6-16-3x8x+20=29x-1021x=30x=10/7