9分之4X+300+0.375X-40=X
问题描述:
9分之4X+300+0.375X-40=X
答
9分之4X+300+0.375X-40=X
x-3/8x-4/9x=300-40
x-27/72x-32/72x=260
13/72x=260
x=1440