(9/20x)/(x+16)=1/4怎么解
问题描述：
(9/20x)/(x+16)=1/4怎么解
答
(9/20x)/(x+16)=1/4
9/20x=1/4(x+16)
9/20x=1/4x+4
(9/20-1/4)x=4
1/5x=4
x=20