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Sagot :

AYUDA

bjr

les x à gauche et les constantes à droite

soit

3x + 5 = x - 12

3x + 5 - 5 = x - 12 - 5

3x = x - 17

3x - x = x - x - 17

2x = -17

2x/2 = -17/2

x = -8,5

2x - 3 = 14

2x - 3 + 3 = 14 + 3

2x = 17

2x/2 = 17/2

x = 8,5

2x + 1 = 11

2x + 1 - 1 = 11 - 1

2x = 10

2x/2 = 10/2

x = 5

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