Question

如何求解此等式？

如何求解x？请写出过程

Answer 1

左边分子分母同乘以 2， 右边分子分母同乘以 120/x， 得
(x-15)/(x+15) = 3/5
5(x-15) = 3(x+15)
2x = 120, x = 60

Answer 2

[(x/2) -7.5]/[(x/2) +7.5] =(x/40)/(x/24)
(x -15)/(x +15) =(x/40)/(x/24)
(x -15)/(x +15) =3/5

5(x -15)=3(x +15)
5x-75=3x+45
2x=120
x=60