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3 x - 7 = 0

3 x = 7

x = 7 /3

( x - 1 ) ( x + 2 ) =  0

x = 1 ou - 2

14 x + 28 - 20 x + 15 =  3 x + 5

- 6 x - 3 x = 5 - 28 - 15

- 9 x = - 38

x = 38/9
3x - 7= 0
3x=7
3x/3=7/3
x=7/3

(x-1)(x+2)=0
Donc x-1=0 ou x+2=0
Donc x= 1 ou x= -2
S={1;-2}

7(2x+4)-5(4x-3)=3x+5
7(2x+4)-5(4x-3)-3x+5 = 0
14x+28-20x+15-3x+5 = 0
-9x+48=0
-9x= -48
-9x/-9 = -48/-9
x= 16/3

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