aidez moi ci vous plait resous les équations suivants a) 2+x-(5+2x)-7=3x+7 b)7(x+4)-3(x+2)=x+7 c)2(x-1)-3(x+1)=4(x-2) d)-7x-4=2(4-1/5x) merci

a)

2+x-(5+2x)-7=3x+7

2+x-5-2x-7=3x+7

-x-10=3x+7

-x-10+10=3x+7+10

-x=3x+17

-x-3x=3x+17-3x

-4x=17

-4x/-4=17/(-4)

x=-17/4

x=-4,25

b)

7(x+4)-3(x+2)=x+7

7x+28-3x-6=x+7

4x+22=x+7

4x+22-22=x+7-22

4x=x-15

4x-x=x-15-x

3x=-15

3x/3=-15/3

x=-5

c)

2(x-1)-3(x+1)=4(x-2)

2x-2-3x-3=4x-8

-x-5=4x-8

-x-5+5=4x-8+5

-x=4x-3

-x-4x=4x-3-4x

-5x=-3

-5x/-5=-3/-5

x=3/5

x=0,6

d)

-7x-4=2(4-1/5x)

-7x-4=8-2/5x

-7x-4+4=8-2/5x+4

-7x=12-2/5x

-7x+2/5x=12-2/5x+2/5x

-7*5/1*5x+2/5x=12

-35/5x+2/5x=12

-33/5x=12

-6,6x=12

-6,6x/6,6=12/6,6

x=12/6,6

2+ x - (5+2x)-7= 3x + 7

2 + x - 5 - 2x - 7 = 3x + 7

x - 2x - 3x = 7 + 7 + 5 - 2

-4x = 17

x = 17/-4

7 (x+4)- 3(x+2) = x+7

7x + 28 - 3x - 6 = x + 7

3x = -15

x = -5

2(x-1)-3(x+1)=4(x-2)

2x - 2 - 3x - 3 = 4x - 8

- 5x = - 3

x = 3/5

-7x-4=2(4-1/5x)

- 7x - 4 = 8 - 2/5 x

- 7 x + 2/5 x = 12

x = -20/11