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[tex]bonjour\\\\\\7 x - 6 = 4 - 3 x \\7 x + 3 x = 5 + 6 \\10 x = 10\\x = 1\\\\\\12 - a = 18 - 3 a\\- a + 3 a = 18 - 12\\2 a = 6 \\a = 3 \\\\\\- t - 4 = 8 + 7 t \\- t - 7 t = 8 + 4 \\- 8 t = 12\\t = - 12/8 = - 3 / 2 \\\\\\13 x + 11 = 8 x + 28 \\13 x - 8 x = 28 - 11 \\5 x = 17 \\x = 17/5 \\\\[/tex]

MAUDMARINE

Bonjour

43)

a. 7x - 6 = 4 - 3x

7x + 3x = 4 + 6

10x = 10

x = 10/10

x = 1 → Entier

b. 12 - a = 18 - 3a

- a + 3a = 18 - 12

2a = 6

a = 6/2

a = 3 → Entier

44)

a. - r - 4 = 8 + 7r

- r - 7r = 8 + 4

- 8r = 12

r = - 12/8

r = 3/2 → Décimal non entier

b. 13x + 11 = 8x + 28

13x - 8x = 28 - 11

5x = 17

x = 17/5 → Non décimal.

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