20х + 32 - 2х=12
18х = - 20
х= - 1 1/9
Д) p (p² - 2a) + a (2a - p²) = p (p² - 2a) - a (p² - 2a) = (p - a)(p² - 2a)
E) x (x³ + x² + x) - (x³ + x² + x) = (x - 1)(x³ + x² + x)
Y=kx+3
X=-8
Y=19
19=-8k+3
8k=-16
K=-2
{3x+7y=13 *3 {9x+21y=39
{3y+13=8x *7 -{-56x+21y=-91
65x=130
x=130/65
x=2 тогда 3*2+7y=13
7y=13-6
7y=7
y=7/7
y=1 Ответ:(2;1)