(3+x)²+(5-2x)(5+2x)-3(5-x²)=1
9+6x+x^2+25-4x^2-15+3x^2=1
19+6x=1
6x=-18
x=-3
(3+х)²+(5-2х)(5+2х)-3(5-х²)=1
9+6х+х²+25-4х²-15+3х²=1
19+6х+х²-4х²-15+2х²=1
19+6х=1
6х=1-19
6х=-18
х=-3
(3+x)²+(5-2x)(5+2x)-3(5-x²)=1
9+6x+x^2+25-4x^2-15+3x^2=1
19+6x=1
6x=-18
x=-3
(3+х)²+(5-2х)(5+2х)-3(5-х²)=1
9+6х+х²+25-4х²-15+3х²=1
19+6х+х²-4х²-15+2х²=1
19+6х=1
6х=1-19
6х=-18
х=-3