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4x - 5 = 2x + 7
4x - 2x = 7 + 5
2x = 12
x = 12/2
x = 6
...........................................................................
7x - 3x + 4 = x + 16
4x + 4 = x + 16
4x - x = 16 - 4
3x = 12
x = 12/3
x = 4
...............................................
Diferencia de cuadrados.
(a - b) (a + b) = a² - b²
(x + 4) (x - 4)
x² - 4²
x² - 16
..............................................................
(x + 5)(x + 2)
x² + 7x + 10