Aider moi svp :
a: 3x -5 = 18
b: 20 - 8x =13
c: 35+4x = 7
d: 1000x + 150 = 30
e: 6x - ( x - 4 ) = 20
f: 3- ( 2x + 1 ) = 5x - 4
g : 3x + 4 ( 1-2x) = 7 - 8x
h: 14 - 2 ( -3x + 9 ) = 4(2x - 7 ) -1
i : 7y + 11 =-9
j: 3y - 5 = y - 7
k: 8- 4x = x+ 48
Merci
a: 3x -5 = 18
b: 20 - 8x =13
c: 35+4x = 7
d: 1000x + 150 = 30
e: 6x - ( x - 4 ) = 20
f: 3- ( 2x + 1 ) = 5x - 4
g : 3x + 4 ( 1-2x) = 7 - 8x
h: 14 - 2 ( -3x + 9 ) = 4(2x - 7 ) -1
i : 7y + 11 =-9
j: 3y - 5 = y - 7
k: 8- 4x = x+ 48
Merci
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3x-5+5=18+5
3x=23
x=23/-3
x=-7,7
3x = 18 + 5
3x = 23
x=23/3
b) 20 - 8x = 13
-8x = 13 - 20
-8x = -7
x = 7/8
c)35 + 4x = 7
4x = 7 - 35
4x = -28
x = -28/4 = -7
d) 1000x + 150 = 30
1000x = 30 - 150
1000x = - 120
1000x = -120/1000 = -12/100 = -0,12
e) 6x - (x - 4) = 20
6x - x + 4 = 20
5x + 4 = 20
5x = 20 - 4 = 16
x = 16/5 = 3,2
f) 3 - (2x + 1) = 5x - 4
3 - 2x - 1 = 5x - 4
2 - 2x = 5x - 4
2 + 4 = 5x + 2x
6 = 7x
x = 6/7
g) 3x + 4(1 - 2x) = 7 - 8x
3x + 4 - 8x = 7 - 8x
-5x + 4 = 7 - 8x
-5x + 8x = 7 - 4
3x = 3
x = 1
h) 14 - 2(-3x + 9) = 4(2x - 7) - 1
14 + 6x - 18 = 8x - 28 -1
-4 + 6x = 8x - 29
-4 + 29 = 8x - 6x
25 = 2x
x = 25/2 = 12,5
i) 7y + 11 = -9
7y = -9 -11
7y = -20
y = -20/7
j) 3y - 5 = y - 7
3y - y = -7 +, 5
2y = -2
y = -1
k) 8 - 4x = x + 48
8 - 48 = x + 4x
-40 = 5x
x = -40/5 = -8