<span> (4х+5)(3-х)=х^2 - 2х</span>
<span>23x - 4x^2 +15 - 5x - x^2 +2x = 0</span>
<span>-5x^2 +20x+15 = 0</span>
<span>-x^2 + 4x +3=0</span>
<span>a = -1</span>
<span>b = 4</span>
c = 3
!/(7х+3)=3
!/ знак корня
возводим в квадрат
7х+3=9
7х=9-3
7х=6
х=6/7
11+4х > 2х -7
2х > -18
х > -9
5 - 4х =< 7х - 5
0 =< 11х
х >= 0
14 +2(-х+7) =< 24 - 3(х-1)
14 + 14 - 2х =< 24+3 - 3х
28 - 2х =< 27 - 3х
1 <= -х
х >= 1
|х| + 7 <= 10
|х| <= 3
-3 < х < 3