Bonjour pouvez vous m'aider pour faire les resoudre les equations suivantes svp merci a) 3x-4=15(x-1). B) 5x-3=6x+1. C) -2(5x-3)=x-12 d). X-5/7=1/5+2x

bonjour


a) 3 x - 4 = 15 ( x - 1) 
    3 x - 4 = 15 x - 15
    3 x - 15 x = - 15 + 4
    - 12 x = - 11 
     x =  11/12 

b) 5 x - 3 = 6 x + 1
    5 x - 6 x = 1 + 3
    - x = 4 
       x = - 4 

c) - 2 ( 5 x - 3) = x - 12 
    - 10 x + 6 = x - 12
    - 10 x - x = - 12 - 6
    - 11 x = - 18 
     x = 18/11 

d) x - 5/7 = 1/5 + 2 x 
    35 x /35 - 25/35 = 7/35 + 70 x /35
     35 x - 70 x = 7 + 25 
     - 35 x = 32 
     x = - 32/35 

Bonjour et bonne année 2018 !

a) 3x - 4 = 15(x - 1)
3x - 4 = 15 * x + 15 * -1
3x - 4 = 15x - 15
3x - 15x = -15 + 4
-12x = -11
x = -11/-12
x = 11/12

b) 5x - 3 = 6x + 1
5x - 6x = 1 + 3
-x = 4
x = -4

c) -2(5x - 3) = x - 12
-2 * 5x - 2 * - 3 = x - 12
-10x + 6 = x - 12
-10x - x = -12 - 6
-11x = -18
x = -18/-11
x = 18/11

d) x - 5/7 = 1/5 + 2x
x - 2x = 1/5 + 5/7
-x = 7/35 + 25/35
-x = 32/35
x = -32/35