Mọi người giúp mình giải các phương trình sau với ạ!! Mình cần gấp ạ!! Mình cảm ơn!! a) 3($x^{2}$+2x+2)=10$\sqrt{x^{3}+2x^{2}+2x+1}$ b) $\sqrt{3x+1}$ - $\sqrt{6-x}$ + 3$x^{2}$ -14x -8=0

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