Dmitry1986

Verified answer

15 - (2x² - 4x) - (7x - 2x²)=0
15 - 2x² + 4x - 7x + 2x²=0
-3x = -15| : (-3)
x= 5

(y³ + 4y² - 6) - (5y - y³ + 6) = 2y³ + 4y² +y
y³ + 4y² - 6 - 5y + y³ - 6 = 2y³ + 4y² +y
y³ + 4y² - 6 - 5y + y³ - 6 - 2y³ - 4y² - y= 0
-6y - 12 = 0
-6y = 12 |: (-6)
y = - 2