(5x - 1)(5x + 1) - (5x - 3)² = 50
25x² - 1 - (25x² - 30x + 9) = 50
25x² - 1 - 25x² + 30x - 9 = 50
-10 + 30x = 50
30x = 50 + 10
30x = 60
x = 60 ÷ 30
x = 2
ОТВЕТ: 2
(5x - 1)(5x + 1) - (5x - 3)² = 50
25x² - 1 - (25x² - 30x + 9) = 50
25x² - 1 - 25x² + 30x - 9 = 50
-10 + 30x = 50
30x = 50 + 10
30x = 60
x = 60 ÷ 30
x = 2
ОТВЕТ: 2