5а² - а = а(5а - 1)
ab²c + abc² = bc(ab + ac)
-3x² + 3y² = -3(x² - у²)
21ab - 7ac + 49a = 7а(3b - с + 7)
-a³ - a²b + a² = -a²(a + b - 1)
-5x²y + 5xy² - 5xyz = -5xy(x - y + z)
5а² - а = а(5а - 1)
ab²c + abc² = bc(ab + ac)
-3x² + 3y² = -3(x² - у²)
21ab - 7ac + 49a = 7а(3b - с + 7)
-a³ - a²b + a² = -a²(a + b - 1)
-5x²y + 5xy² - 5xyz = -5xy(x - y + z)