Tusweet
Tusweet
30-09-2018
Mathematics
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3. TU = 2x, UB = 3x + 1, TB = 21
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Аноним
Аноним
30-09-2018
TU + UB = TB
2x + 3x + 1 = 21
5x = 21 - 1
5x = 20
x = 4
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