（一）7/5-3X=0.4
3x=7/5-0.4=1.4-0.4=1
x=3*1=3
（二）5/14X+（5/6）*（6/5）不是方程（无等号）5/14X+（5/6）*（6/5）=10/75/14X+（5/6）*（6/5）=10/75/14X+1=10/75/14X=10/7-1=3/7X=(3/7)*(14/5)=6/5