x² - y² = (x - y)(x + y)
(x -+ y)² = x² -+ 2xy + y²
(x - 2)(x + 2) = 3(x + 4)² - 2x(x + 5)
x² - 4 = 3(x² + 8x + 16) - 2x² - 10x
3x² + 24x + 48 - 2x² - 10x - x² + 4 = 0
14x + 52 = 0
14x = -52
x = -52/14 = -3 10/14 = - 3 5/7
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x² - y² = (x - y)(x + y)
(x -+ y)² = x² -+ 2xy + y²
(x - 2)(x + 2) = 3(x + 4)² - 2x(x + 5)
x² - 4 = 3(x² + 8x + 16) - 2x² - 10x
3x² + 24x + 48 - 2x² - 10x - x² + 4 = 0
14x + 52 = 0
14x = -52
x = -52/14 = -3 10/14 = - 3 5/7