bonjour , j'ai des gros equations à faire et je ne comprends rien ,j'ai besion de votre aide.svp Résoudre les équation suivantes : 2x = 13 ; 7x = -23 ; -13x = 7

Bonsoir,

A) 2x = 13

x = 13/2

S={13/2}

B) 7x = -23

x = -23/7

S={-23/7}

C) -13x = 74

x = -74/13

S={-74/13}

D) -16x = -5

x = 5/16

S={5/16}

E) (2/3)x = 5

x = 15/2

S={15/2}

F) (-5/7)x = 5/6

x = 5/6 * (-7/5)

x = -35/30

x = -7/6

S={-7/6}

G) 2x + 3 = 4

2x = 1

x = 1/2

S={1/2}

H) 7x - 5 = 14

7x = 19

x = 19/7

S={19/7}

I) (-144/81)x + 13 = 1

(-144/81)x = -12

x = -12 * (-81/144)

x = 972/144

x = 243/36

S={243/36}

Bonjour

2x = 13

X = 13/2

7x = -23

X = -23/7

-13x = 74

X = -74/13

-16x = -5

X = -5/-16 = 5/16

(2/3)x = 5

X = 5 *3/2

X = 15/2

(-5/7)x = 5/6

X = 5/6 * -7/5

X = -7/6

2x + 3 = 4

2x = 4-3

2x = 1

X = 1/2

7x-5 = 14

7x = 14+5

7x = 19

X = 19/7

(-144/81)x + 13 = 1

-144/81x = 1-13

-144/81x = -12

X = -12 * -81/144

X =  81/12

X = 27*3/4*3

X = 27/4