Question

x - 1/2x - 1/4x -1/7x = 3
или
x - 0.5x - 0.25x - 1/7x = 3

Answer 1

x - 1/2x - 1/4x -1/7x = 3 
х-14/28х-7/28х-4/28х=3
х-25/28х=3
28/28х-25/28х=3
3/28х=3
х=3:3/28
х=3*28/3
х=28