x/6-12.5X7=2/3
方程两边X6,去分母)
x-525=4
x=529
(1减9分之7)x=15分之2
2x/9=2/15
x=9/15
x=3/5
1/6x-12.5x7=2/3
1/6x-175/2=2/3 (各项都乘以6即可约去分母)
x-525=4
x=529
【比x6分之X+6分之X+20】比【x-6之x-6分之x-20]=7比5的解
1/6x-12.5*7=2/3
x-12.5*7*6=4
x=4+525
x=529
易得: X=529