решите уравнения
а) 2(5-3х)=6-5х
б) 2(1-х)-4(2х+8)=8х+28
в) 1/2+1/4х=х-3/4

а) 2(5-3х)=6-5х

10-6x=6-5x

10-6=6x-5x

4=x

б) 2(1-х)-4(2х+8)=8х+28

2-2x-8x-32=8x+28

-10x-30=8x+28

-10x-8x=28+30

-18x=58

x=-58/18

x=-3,2(2)

в) 1/2+1/4х=х-3/4

1/4x-x=-3/4-1/2

-3/4x=-5/4

x=5/3