Задание во вложениях
Нужно б, з,к, в.
Дам 20б

б)1/4x+5/8=3/41/4x=3/4-5/81/4x=1/8x=1/8:1/4x=1/8*4/1x=1/2=======================з)x/2+x/4=-33x/4=-33x=-3*43x=-12x=-12:3x=-4======================к)7/9x-3/4x=5/18(28-27)/36x=5/181/36x=5/18x=5/18:1/36x=5/18*36/1x=10==========================в)0,4x-3,2=2,80,4x=2,8+3,20,4x=6x=6:0,4x=15