Giải phương trình:
a) 2$x^{2}$ - 5x + 2 = 5$\sqrt{(x^2 - x -20)(x+1)}$
b) $3x^{2}$ - 11x - 22 = 7$\sqrt{(x^2-5x-14)(x+5)}$
c) 2$\sqrt{x+2+2\sqrt{x+1}}$ - $\sqrt{x+1}$ = 4
d) $\sqrt{x^2+9}$ - $\sqrt{x^2+7}$ =2
e) $\sqrt{5x-1}$ - $\sqrt{x-1}$ = $\sqrt{2x-4}$
f) $\sqrt[3]{x+34}$ - $\sqrt[3]{x-3}$ = 1
g) $\sqrt{x^2 - 8x + 15}$ + $\sqrt{x^2 -2x + 15}$ = $\sqrt{x^2 - 9x +18}$