(0.03/5X-1)-(0.05/3X=2)=4

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(0.03/5X-1)-(0.05/3X-2)=4
(3-500X)/500X - (5-600X)/300X=4 同时乘1500X
9-1500X-25+3000X=6000X
X= -4/1125

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