(2х-3)(2х+3)=4х²+3(х-1)
4х²-9=4х²+3х-3
4х²-4х²-3х=9-3
- 3х=6
х=6:( -3)
х= - 2
4(х-5)-5х²=5(1-х)(1+х)
4х-20-5х²=5(1-х²)
4х-20-5х²=5-5х²
4х=5+20
4х=25
х=25:4
х=6,25
(3х-2)(3х+2)-7х(х+1)=2(х-1)(х+1)
9х²-4-7х²-7х=2(х²-1)
2х²-4-7х=2х²-2
-7х=4-2
-7х=2
х=-2:7
х= - 2/7
(3-4х)(4х+3)+(3х+2)(х-3)=13х(2-х)-8
9-16х²+3х²-9х+6х-6=26х-13х²-8
- 13х²+13х²-3х-26х=6-8-9
-29х= -11
х=11/29