Solve: $\dfrac{3+\sqrt{3}}{3-\sqrt{3}}+\dfrac{3-\sqrt{3}}{3+\sqrt{3}}+\dfrac{1}{3+\sqrt{3}}-\dfrac{1}{3-\sqrt{3}}$
Find: 3+(-3)+3-(-3)+3+(-3)+3-(-3)
Solve this problem 3+3+3+3+3+3+3+3+3+3+1+2=??