500×0.9-(X-500)×0.8=554

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500×0.9-(X-500)×0.8=554
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500×0.9-(X-500)×0.8=554
500×0.9-(X-500)×0.8=554

500×0.9-(X-500)×0.8=554
500×0.9-(X-500)×0.8=554
450-(X-500)×0.8=554
(X-500)×0.8=-96
X-500=-120
X=500-120
X=380

过程:450-(X-500)x0.8=554
(X-500)x0.8=-104
X-500=-130
X=500-130
X=370

500×0.9-(X-500)×0.8=554
500×0.9-0.8x+500×0.8=554
500×(0.9+0.8)-0.8x=554
850-0.8x=554
850-554=0.8x
0.8x=296
x=370