Решите уравнения: 1)5+2x=0 2) (x--4)=15

1)5+2х=0
2х=-5
х=-5:2
х= -2,5

2)(х-3)-(3х-4)=15
х-3-3х+4=15
-2х=15+3-4
-2х=14
х= -7

1) 5 + 2x = 0,
2x = -5,
x = -5 / 2

2) (x - 3) - (3x - 4) = 15,
x - 3 - 3x + 4 = 15,
-2x - 3 + 4 = 15,
-2x + 1 = 15,
-2x = 15 - 1,
-2x = 14,
x = -14 / 2,
x = -7.

ответ: 1) - 5/2; 2) -7.