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Sagot :

AYUDA

2x + 1 - 1 = 13 - 1

2x = 12

2x/2 = 12/2

x = 6

on a bien 2 * 6 + 1 = 12 + 1 = 13

puis

-3x + 20 = 14

-3x + 20 - 20 = 14 - 20

-3x = -6

-3x/(-3) = -6/(-3)

x = 2

on a bien 20 - 3*2 = 20 - 6 = 14

et la dernière

2x + 1/7 - 1/7 = 1 - 1/7

2x = 6/7

x = 6/7 * 1/2

x = 6/14

x = 3/7

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