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Exercices 21 a 31, resoudre chaque équation.
27 a. 9 - 2a =-3
b. 4t + 3 = -2t
28 a. 5x + 3 = 0
b. 0= -7y +5
29 a. 2y + 9 = 4 – 3y
b. -2x – 5 = x + 2
30 a. 1 + 2x = 3x - 7
b. 7t + 22 = 14 - 4t
31 a. 0,7m=-1,8m - 10 b. -y – 3,8 = 2y – 7,4

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SEBOSS

27a

-2a=-3-9 = -12

-a= -6

a=-6

27b

3=-2t-(-4t)

3=-6t

t=-3/6

28a

5x=-3

x=-3/5

28b

-7y=-5

-y=7/5

y=-7/5

29a

2y + 3y = 4-9

5y = -5

y=-1

29b

-2x + x = 2+5

-x = 7

x = 7

30a

2x-3x = -7-1

-x= -8

x = 8

30b

7t + 4t = 14 - 22

11t = -8

t = -8/11

31a

0.7m + 1.8m = -10

2.5m = -10

m = -10/2.5 = -4

31b

-y - 2y = -7.4 + 3.8

-3y = -3.6

-y = -3.6/3

y = 3.6/3 = 1.2

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