Question

х-4=2(39-х+4) плиз

спасибо

Answer 1

х-4=2(39-х+4)
х-4=78-2х+8
х+2х=78+8+4
3х=90
х=30

Answer 2

х-4=2(39-х+4)
x - 4 = 78 - 2x + 8
x + 2x = 78 + 8 +4
3x = 90 / :3
х = 30