1.
7х+х=-56
8х=-56
х=-7
2.х^2+5х-24=0
(х+3)(х-8)=0
х1=-3 х2=8
3.
2х^2-7х-9=0
(х+1)(2х-9)=0
х1=-1 х2=9/2
4.х^2-5х=14
(х+2)(х-7)=0
х1=-2 х2=7
5. -1-3х=2х+1
-3х-2х=1+1
-5х=2
х=-2/5
6. 3(7-х)=5+2х
21-3х=5+2х
-3х-2х=-21+5
-5х=-16
х=16/5
7.(-х-4)(3х+3)=0
-х-4=0
х=-4
3х+4=0
3х=-4
х=-1
8.11/х+3=10
11=10(х+3)
-10х=19
х=-19/10
9.
12-3х=5х+8
-3х-5х=8-12
-8х=-4
х=1/2
воть)))))))