Mathématiques

Question

trouver x
a)4x-2=3x+9
b)3x+7=-2+12
c)-2x+5=-4x-6
d)3x-7=-4x+12

1 Réponse

  • a) 4x - 2 = 3x + 9
    4x - 3x = 2 + 9
    x = 11

    b) 3x + 7 = - 2 + 12
    3x = 10 - 7
    3x = 3
    x = 1

    c) - 2x + 5 = - 4x - 6
    - 2x + 4x = - 5 - 6
    2x = - 11
    x = - 11 / 2

    d) 3x - 7 = - 4x + 12
    3x + 4x = 7 + 12
    7x = 19
    x = 19 / 7

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