`(4x^2-9)(x+2)=(2x+3)(x^2-4)`
`<=>4x^3+8x^2-9x-18-2x^3+8x-3x^2+12=0`
`<=>(2x^2+7x+6)(x-1)=0`
`<=>(x+2)(2x+3)(x-1)=0`
`<=>x={-2;-3/2;1}`
`(x-3)(x+4)(17x^2-17x+8)=(x-3)(x+4)(8x^2-17x+24)`
`<=>17x^4-213x^2+212x-96=8x^4-9x^3-89x^2+228x-288`
`<=>9x^4-124x^2-16x+192+9x^3=0`
` <=>(x+4)(9x^2-16)(x-3)=0`
`<=>x={-4;3;+-4/3}`
`x^4+x^3-8x-8=0`
`<=>(x+1)(x^3-8)=0`
`<=>x=-1` hoặc `x=2`
`(x-2)^2-4+x^2=(2-x)(x+5)`
`<=>x^2-4x=2x+10-x^2-5x`
`<=>2x^2-4x+3x-10+x^2=0`
`<=>(3x+5)(x-2)=0`
`<=>x=-5/3` hoặc `x=2`