bonjour
a) - 7 x + 3 = 8
- 7 x = 8 - 3
- 7 x = 5
x = - 5/7
b) 13 x - 11 = 14 x + 12
13 x - 14 x = 12 + 11
- x = 23
x = - 23
c) 20 - 4 x = 6 x + 9
- 4 x - 6 x = 9 - 20
- 10 x = - 11
x = 11/10 = 1.1
A) -7x + 3 = 8
-7x = 8 - 3
-7x = 5
x = -5/7
B) 13x - 11 = 14x + 12
[Tu commences par isoler les "x" d'un côté et les entiers de l'autre.]
13x - 14x = 12 + 11
-x = 23
x = -23
C) 4*(5 - x) = 3*(2x + 3)
[On développe.]
20 - 4x = 6x + 9
[On isole les termes semblables.]
20 - 9 = 6x + 4x
11 = 10x
11/10 = x
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bonjour
a) - 7 x + 3 = 8
- 7 x = 8 - 3
- 7 x = 5
x = - 5/7
b) 13 x - 11 = 14 x + 12
13 x - 14 x = 12 + 11
- x = 23
x = - 23
c) 20 - 4 x = 6 x + 9
- 4 x - 6 x = 9 - 20
- 10 x = - 11
x = 11/10 = 1.1
A) -7x + 3 = 8
-7x = 8 - 3
-7x = 5
x = -5/7
B) 13x - 11 = 14x + 12
[Tu commences par isoler les "x" d'un côté et les entiers de l'autre.]
13x - 14x = 12 + 11
-x = 23
x = -23
C) 4*(5 - x) = 3*(2x + 3)
[On développe.]
20 - 4x = 6x + 9
[On isole les termes semblables.]
20 - 9 = 6x + 4x
11 = 10x
11/10 = x