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Oxana [17]
3 years ago
14

Please help !! 25 points !!!

Mathematics
1 answer:
EastWind [94]3 years ago
8 0

Answer:

30

Step-by-step explanation:

70-40=30

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\bf \begin{cases}&#10;E+CD=70000\implies \boxed{CD}=70000-E\\&#10;E=3CD+10000\\&#10;------------------\\&#10;E=3\left( \boxed{70000-E}\right)+10000&#10;\end{cases}&#10;\\\\\\&#10;E=210000-3E+10000\implies 4E=200000\implies E=\cfrac{200000}{4}&#10;\\\\\\&#10;E=50000

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