1)
[tex]-3e + 4 + e =8+2e-1\\\\-2e+4 =2e+7\\\\-2e-2e = 7-4\\\\-4e = 3 \ \ /:(-4)\\\\\boxed{e = -\frac{3}{4}}[/tex]
2.
[tex]2 + 6x - 9 = 14 - 4x + 3x\\\\6x - 7 = 14 - x\\\\6x+x = 14+7\\\\7x = 21 \ \ /:7\\\\\boxed{x = 3}[/tex]
3.
[tex]2 - 4d + 8d - 6 = -7d + 4 - 3d\\\\4d - 4 = -10d + 4\\\\4d + 10d = 4+4\\\\14d = 8 \ \ /:14\\\\\boxed{d = \frac{4}{7}}[/tex]
