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Sagot :

AYUDA

bjr

x + 7 = 6

x + 7 - 7 = 6 - 7

x = -1

-5x = 7

-5x * 3 = 7 * 3

-15x = 21

x - 9 = - 5

x - 9 + 15 = - 5 + 15

x + 6 = 10

-2x = -8

-2x * 3 = -8 * 3

-6x = -24

etc..

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