100(95-x) - 80(100-x) = 100

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100(95-x) - 80(100-x) = 100
100(95-x) - 80(100-x) = 100

100(95-x) - 80(100-x) = 100
100(95-x) - 80(100-x) = 100 9500-100x-8000+80x=100 -20x=100-1500 -20x=-1400 x=70

是要找x=多少吗?