посчитайте решить примеры .

1. x = -6

2. x =

3. y = -1

1) 5 - ( 3 + 4x - 2x² ) = 2x² - 3x + 8

5 - 3 - 4x + 2x² = 2x² - 3x + 8

5 - 3 - 4x = -3x + 8

2 - 4x = -3x + 8

-4x + 3x = 8 - 2

-x = 6

x = -6

2) 12 + ( 5x + 3x² ) - ( 3x² - 2x ) = 0

12 + 5x + 3x² - 3x² + 2x = 0

12 + 7x = 0

7x = -12

x =

3) ( 3y³ + 2y² - 4 ) - ( 2y³ + 4y² - 8y ) = y³ - 2y² - 12

3y³ + 2y² - 4 - 2y³ - 4y² + 8y = y³ - 2y² - 12

y³ - 2y² - 4 + 8y = y³ - 2y² - 12

-4 + 8y = -12

8y = -12 + 4

8y = -8

y = -1