Simplify: x2+5x+6x2+4x+3\dfrac{x^2 + 5x + 6}{x^2 + 4x + 3}x2+4x+3x2+5x+6.
x+2x+1\dfrac{x + 2}{x + 1}x+1x+2
x+3x+1\dfrac{x + 3}{x + 1}x+1x+3
x+2x+3\dfrac{x + 2}{x + 3}x+3x+2
x+6x+3\dfrac{x + 6}{x + 3}x+3x+6