`(x-1)(x+3)=x^2+4`
`<=>x^2+2x-3=x^2+4`
`<=>x=7/2`
`(x-2)^2=(x-3)(x+2)`
`<=>x^2-4x+4=x^2-x-6`
`<=>3x=10`
`<=>x=10/3`
`(x-1)(x+3)-(x+2)(x-3)=0`
`<=>x^2+3x-x-x^2+3x-2x+6=0`
`<=>3x+3=0`
`<=>x=-1`
`(x-2)(x-5)-(x-3)(x-4)=0`
`<=>x^2-5x-2x+10-x^2+4x+3x-12=0`
`<=>-2=0` (vô lí)
`=>` Pt vô no.
`(3x-2)(4x+3)=2x(6x-1)`
`<=>12x^2+9x-8x-6=12x^2-2x`
`<=>-3x=-6`
`<=>x=2`
Vậy ............................