Sagot :

arianasarah

Bonjour

2x+10=x+40

2x-x=40-10

x=30

3x-37=-5x+41

3x+5x=41+37

8x/8=78/8

x=9.75

5-x=x-13

-x+5(-x)=x-13(-x)

-2x+5=-13

-2x+5(-5)=-13(-5)

-2x/-2=-18/-2

x=9
1. 2x + 10 = x + 40
2x - x = 40 -10
x = 30

2. 3x - 37 = -5x + 41
3x + 5x = 41 + 37
8x = 78
x = 78/8
x = 9,75

3. 5 - x = x - 13
-x - x = -13 - 5
-2x = -18
x = -18/-2
x = 9