Решение и ответ:

-4 - 6x = 4x - 3

-6x - 4x = -3 + 4

-10x = 1

x = 1 ÷ (-10)

x = -1/10

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(x - 5)² = (x + 10)²

x² - 10x + 25 = x² + 20x + 100

x² - x² - 10x - 20x = 100 - 25

-30x = 75

x = 75 ÷ (-30)

x = - 5/2 = -2.5