Répondre :
1) 8x-9=79
8x=79+9
8x=88
x = 88/8 = 11
2) 3x+2 = x+20
3x-x = 20-2
2x = 18
x = 18/2 = 9
3) x+3+3x-1 = x+11
4x+2 = x+11
4x-x = 11-2
3x = 9
x = 9/3 = 3
4) 7x = 4(x+3)
7x = 4x+12
7x-4x = 12
3x = 12
x = 12/3 = 4
8x=79+9
8x=88
x = 88/8 = 11
2) 3x+2 = x+20
3x-x = 20-2
2x = 18
x = 18/2 = 9
3) x+3+3x-1 = x+11
4x+2 = x+11
4x-x = 11-2
3x = 9
x = 9/3 = 3
4) 7x = 4(x+3)
7x = 4x+12
7x-4x = 12
3x = 12
x = 12/3 = 4
Bonjour,
8x - 9 = 79
8x = 79 + 9
x = 88/8
x = 11
3x + 2 = x + 20
3x - x = 20 - 2
2x = 18
x = 18/2
x = 9
x + 3 + 3x - 1 = x + 11
4x - x = 11 - 2
3x = 9
x = 9/3
x = 3
7x = 4(x + 3)
7x = 4x + 12
7x - 4x = 12
3x = 12
x = 12/3
x = 4
8x - 9 = 79
8x = 79 + 9
x = 88/8
x = 11
3x + 2 = x + 20
3x - x = 20 - 2
2x = 18
x = 18/2
x = 9
x + 3 + 3x - 1 = x + 11
4x - x = 11 - 2
3x = 9
x = 9/3
x = 3
7x = 4(x + 3)
7x = 4x + 12
7x - 4x = 12
3x = 12
x = 12/3
x = 4
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