1. 2x+5=2(x+6) 2. (1-4x)(1-3x)=6x(2x-1) 3. (7x+1(3x-1)-21x^=3 help m! !

1. 2х+5=2х+12
0≠7
2. 1-3х-4х+12х^2=12х^2-6х
1-7х=-6х
6х=6х
х=1
3. 21х^2-7х+3х-1-21х^2=3
-4х-1=3
-4х=4
х=-1

1) 2x+5 = 2x+12
    2x-2x =12-5
    0 7
2) (1-4x)(1-3x) = 6x(2x-1)
    1-3x-4x+12x^{2} = 12x^{2} - 6x
    -3x-4x+6x= -1
    -x = -1
    x = 1
3) (7x+1)(3x-1)-21x^2=3
   21x^2-7x+3x-1-21x^2=3
   -4x-1=3
   -4x = 3+1
   -4x=4
  x= -1