19. Simplifique as expressões a seguir:
a) ( x + 6)² - (x - 6)²
b) ( x + 10)² - 2 ( x + 5 )²
c) ( 4x + 3)² - ( 4x +3)
d) 5(x+1)² - (5x + 1)² + (x - 5)²
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