Urgent pour demain !!

bonsoir

7 x /5 = 3 x - 1/5

a) 35 x / 5 = 15 x - 5/5

b ) 35 x/5 - 15 x = - 5/5
      35 x -  75 x = - 5 
    - 40 x = - 5
          x = 5/40 = 1/ 8

( 3 x - 1) /4 = 1/5
  15 x - 5 = 4 
   15 x = 4 + 5
  15 x = 9 
x = 9/15 

1)
a)
A.7/5x=3x-1/5
b)
A.7/5x=3x-1/5
A.7/5x=15x/5-1/5
A.7x=15-1
A.7x=14
A.x=14/7
A.x=2

2)
B.(3x-1)/4=1/5
B.(15x-5)/20=4/20
B.15x-5=4
B.15x=4+5
B.15x=9
B.x=9/15
B.x=0.6