Bonjour pourriiez vous m'aidez sur cet exercice de math solution d'équation : a.5x-7=8 b.-2=18+10y c.7+9y= -29 d.3(x-1)=3 e. 12 -6x=3/2 f.5x/3x+1/5 2x/3x-1/5

Bonjour,

a.5x-7=8

5x = 8+7 = 15

x= 15/5 = 3

b.-2=18+10y

-2-18 = 10y

-20 = 10y

y = -20/10 = -2

c.7+9y= -29

9y = -29 -7

9y = - 36

y= -36/9 = -4

d.3(x-1)=3

x-1 = 3/3 = 1

x= 1+1 = 2

e. 12 -6x=3/2

12- 3/2 = 6x

24/2 -3/2 = 6x

21/2 = 6x

x= (21/2) /6

x= 21/(6*2)=  21/12

f.5x/3x+1/5 2x/3x-1/5

le signe=?