(2x+1/5)÷(3+1/2)=75%
(2x+1/5)÷(7/2)=3/4
两边乘7/2
2x+1/2=3/4×7/2=21/8
2x=21/8-1/2=17/8
x=17/8÷2=17/16=1+1/16
x=1又16分之1