Question

x(x+1)+3(x+4)-12=x(2x-1)

Answer 1

....................resposta

Answer 2

x(x+1) + 3(x+4) - 12 = x(2x-1)
x² + x + 3x + 12 - 12 = 2x² - x
x² + 4x = 2x² - x
x² - 2x² = -x - 4x
-x² = -5x
-x² + 5x = 0

x.(-x + 5) = 0

x = 0

ou....

-x + 5 = 0
-x = -5
x = 5