Sagot :
2x + 3 = -5x +7
on regroupe les X du meme coter donc :
2x+ 5x = -3+7
7x = 4
x = 7/4 = 1.75
2) je c pas
3) 4x + 10 = 8x+ 10
On regroupe les X du meme cotes donc:
4x -8x = -10 +10
-4x = 0
x = -4 /0
4) 5x+ 7 = 5x + 9
on regroupe les X du meme cotes donc :
5x-5x = -7+9
0x = 2
x= 0/2
on regroupe les X du meme coter donc :
2x+ 5x = -3+7
7x = 4
x = 7/4 = 1.75
2) je c pas
3) 4x + 10 = 8x+ 10
On regroupe les X du meme cotes donc:
4x -8x = -10 +10
-4x = 0
x = -4 /0
4) 5x+ 7 = 5x + 9
on regroupe les X du meme cotes donc :
5x-5x = -7+9
0x = 2
x= 0/2
2x+3 = -5x+7
2x+3-2x = -5x+7-2x
3-7 = -7x + 7 -7
-4 = -7x
x = 4/7
x/9 = -4/7
x/9*9 = -4/7*9
x = -36/7
4x + 10 = 8x + 20
4x +10 - 10 = 8x + 20 - 10
4x - 8x = 8x + 10- 8x
-4x = 10
x = -4/10 = -2/5
5x+7 - 9 = 5x+9 - 9
5x-2 = 5x
-2 = 1x
2x+3-2x = -5x+7-2x
3-7 = -7x + 7 -7
-4 = -7x
x = 4/7
x/9 = -4/7
x/9*9 = -4/7*9
x = -36/7
4x + 10 = 8x + 20
4x +10 - 10 = 8x + 20 - 10
4x - 8x = 8x + 10- 8x
-4x = 10
x = -4/10 = -2/5
5x+7 - 9 = 5x+9 - 9
5x-2 = 5x
-2 = 1x