解方程:0.75*4000(x-1)+4000=0.8*4000x要有过程.

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解方程:0.75*4000(x-1)+4000=0.8*4000x要有过程.

解方程:0.75*4000(x-1)+4000=0.8*4000x要有过程.
解方程:0.75*4000(x-1)+4000=0.8*4000x
要有过程.

解方程:0.75*4000(x-1)+4000=0.8*4000x要有过程.
原式可化为:
3000X-3000+4000=3200X
200X=1000
X=5