`(x-2)^2 - (x-3)(x+3) = 6`
`<=>x^2-4x+4-x^2+9=6`
`<=>-4x+13=6`
`<=>x=7/4`
`4(x-3)^2 - (2x-1)(2x+1) = 10`
`<=>4x^2-24x+36-4x^2+1= 10`
`<=>-24x+37=10`
`<=>x=9/8`
`(x-4)^2 - (x-2)(x+2) = 6`
`<=>x^2-8x+16-x^2+4=6`
`<=>-8x=-14`
`<=>x=7/4`
`9 (x+1)^2 - (3x-2)(3x+2) = 10`
`<=>9x^2+18x+9-9x^2+2x^2=10`
`<=>18x+13=10`
`<=>x=-1/6`