5(2у-9)-+6у=4(3у-2)-21 5у+7(3-у)=3(5-2у)-6 7у-4(3у+5)=2-3(4у-9) - вопрос №3516702529643221573352674352349 от elyushik 17.04.2021 18:43

Question

Математика: 5(2у-9)-+6у=4(3у-2)-21 5у+7(3-у)=3(5-2у)-6 7у-4(3у+5)=2-3(4у-9)

elyushik · Answer

10Y - 45 + 6Y = 12Y - 8 - 21
16Y - 45 = 12Y - 29
16Y - 12Y = - 29 + 45
4Y = 16
Y = 4

5Y + 21 - 7Y = 15 - 6Y - 6
- 2Y + 21 = - 6Y + 9
- 2Y + 6Y = 9 - 21
4Y = - 12
Y = - 3

7Y - 12Y - 20 = 2 - 12Y + 27
- 5Y - 20 = - 12Y + 29
12Y - 5Y = 29 + 20
7Y = 49
Y = 7