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Meilleure réponse !
2013-06-02T17:59:42+02:00
A) 2x+5=15-3x
2x+3x=15-5
5x=10
x=2

b) -6x+4=-1-x
4+1=-x+6x
5=5x
x=1

c) 7m+10=m-8
7m-m=-8-10
6m=-18
m=-3

d) -12y=4-13y
-12y+13y=4
y=4
2013-06-02T18:01:48+02:00

a) 2x + 5 = 15 - 3x

2x + 3x = 15 - 5

5x = 10 

x = 10sur5

x = 2

 

b) -6x + 4 = -1 - x

-6x + x = -1 -4 

-5x = -5

x = -5sur-5

x = 1

 

c) 7m + 10 = m - 8

7m - m = -8 -10 

6m = -18

m = -18sur6

m = -3

 

d) -12y = 4 - 13y

-12y + 13y = 4

y = 4