1) 7m - n + 49² - n² = $7m+49$ - $n+n$$n-n$ = 7$m+7$ - $n+7$$n-7$

2) 24x² - 4xy + y² - 16 = $4x-y-4$$6x-y+4$

3) xy⁴ - 2y⁴ - xy + 2y = y$x{y}^3-2y^3-x+2$

4) 9 - x² - 2xy - y² = $3-x-y$$3-x+y$

Уравнения:

1) 5x³ - 5x = 0
5x$x^2-1$ = 0
5x$x-1$$x+1$ = 0
x = 0, x = 1, x = -1

2) 64x³16x² + x = 0
x$64x^2-16x+1$ = 0
x$8x-1$² = 0
x = 0, x = 1/8

3) x³ - 3x² - 4x + 12 = 0
$x^3-3x^2$ - $4x-12$ = 0
x²$x-3$ - 4$x-3$ = 0
$x^2-4$$x-3$ = 0
$x+2$$x-2$$x-3$ = 0
x = -2, x = 2, x = 3