1/4 ^ ( 12 - 3х ) = 64
4 ^ ( - 12 + 3х ) = 4 ^ 3
- 12 + 3х = 3
3х = 15
х = 5
5x+13<0 5x<-13 x<-13/5=-2.6
<span>x+5>1 x>-4 чЮ-4
x=(-4 -2.6)</span>
sina/(1+cosa)+(1+cosa)/sina=2/sina
1) 4х+5=2х-7
4х-2х= -7-5
2х= -12
х= -6
2)5х-7=13
5х=20
х=4
3)3х+6=2х+4
3х+2х=4-6
5х= -2
х= -0,4