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Bonsoir pouvez vous m'aider svp pour ces équations je suis complètements bloqués ! :/ Serais-se possible que vous m'éxpliquiez étapes par étapes ? Merci d'avance ! :)

a) -5(x+2)+3(x-3)=7
b) 4(-x+1)-2(3x-5)=0
c) 7(2x-6)-4(5x-8)=-5x

Sagot :

Bonsoir,

a) -5(x + 2) + 3(x - 3) = 7
-5*x - 5*2 + 3*x - 3*3 = 7
-5x - 10 + 3x - 9 = 7
-5x + 3x = 7 + 10 + 9
-2x = 26
x = 26/(-2)
x = -13


b) 4(-x + 1) - 2(3x - 5) = 0
4*(-x) + 4*1 - 2*(3x) - 2*(-5) = 0
-4x + 4 - 6x + 10 = 0
-4x - 6x = -4 - 10
-10x = -14
x = -14/(-10)
x = 7/5


c) 7(2x - 6) - 4(5x - 8) = -5x
7*(2x) -7* 6 - 4*(5x) - 4*(-8) = -5x
14x - 42 - 20x + 32 = -5x
14x - 20x + 5x = 42 - 32
-x = 10
x = -10
A) -5(x + 2) + 3(x - 3) = 7
-5*x - 5*2 + 3*x - 3*3 = 7
-5x - 10 + 3x - 9 = 7
-5x + 3x = 7 + 10 + 9
-2x = 26
x = 26/(-2)
x = -13


B) 4(-x + 1) - 2(3x - 5) = 0
4*(-x) + 4*1 - 2*(3x) - 2*(-5) = 0
-4x + 4 - 6x + 10 = 0
-4x - 6x = -4 - 10
-10x = -14
x = -14/(-10)
x = 7/5


C) 7(2x - 6) - 4(5x - 8) = -5x
7*(2x) -7* 6 - 4*(5x) - 4*(-8) = -5x
14x - 42 - 20x + 32 = -5x
14x - 20x + 5x = 42 - 32
-x = 10
x = -10

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