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30-09-2018
Mathematics

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3. TU = 2x, UB = 3x + 1, TB = 21

Respuesta :

Аноним Аноним

30-09-2018

TU + UB = TB

2x + 3x + 1 = 21

5x = 21 - 1

5x = 20

x = 4

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