(1-1/4)X- (1/4X-5)=20 该怎么算?

问题描述:

(1-1/4)X- (1/4X-5)=20 该怎么算?
要写清楚过程.

(1-1/4)X- (1/4X-5)=20
3/4x-1/4X+5=20
1/2x=20-5
x=15*2=30