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Sagot :

Réponse:

1)x=-1

2)x=0,1

3)x=-4

Explications étape par étape:

1)

[tex]5x + 1 = 2x - 2 \\ 5x + 1 - 1 - 2x = 2x - 2 - 1 - 2x \\ 3x = - 3 \\ \frac{3x}{3} = \frac{ - 3}{3} \\ x = - 1[/tex]

2)

[tex]3 - 7x = 3x + 2 \\ 3 - 7x - 3 - 3x = 3x + 2 - 3 - 3x \\ - 10x = - 1 \\ \frac{ - 10x}{ - 10} = \frac{ - 1}{ - 10} \\ x = 0.1[/tex]

3)

[tex]4x + 2 = x - 10 \\ 4x + 2 - 2 - x = x - 10 - 2 - x \\ 3x = - 12 \\ \frac{3x}{3} = \frac{ - 12}{3} \\ x = - 4[/tex]

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