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Sagot :

Bonjour

2y - 3 = 5y

2y - 5y = 3

- 3y = 3

y = - 3/3 = - 1

4y - 10 = 22

4y = 22 + 10

4y = 32

y = 32/4 = 8

3y = y/2 + 5

3y - y/2 = 5

6y - y = 10

5y = 10

y = 10/5 = 2

7 (y + 1) = 9y - 1

7y + 7 = 9y - 1

7y - 9y = - 1 - 7

- 2y = - 8

y = 8/2 = 4.

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