(3/4x+1)×8=7x+1
3/4x×8+1×8=7x+1
6x+8=7x+1
7x-6x=8-1
x=7
（1/2x+1/3）×2=3x-1/2
x+2/3=3x-1/2
3x-x=2/3+1/2
2x=7/6
x=7/6÷2
x=7/12