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hirondelle52

Bonjour;

a) 4x+22=34

4x= 34-22

4x = 12

x = 12/4

x=3

b) 23m + 14 = 7m – 2

23m-7m = -2-14

16m = -16

n = -16/16

m = -1

c) 9x=3(x–8)

9x=3x-24

9x-3x = -24

6x = -24

x = -24/6

x = -4

d) 3(2t + 5) = 4(5t + 7)

6t +15 = 20t +28

15-28 = 20t -6t

-13 = 14t

t = -13/14

e) 2(3x+4)–5(1–2x)=7(2x–3)+12

6x +8 -5 +10x = 14x -21 +12

16x +3 = 14x -9

16x-14x = -9 -3

2x = -12

x = -12/2

x = -6

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