`d). {13-x}/{x+3}+{6x^2+6}/{x^4-8x^2+9}-{3x+6}/{x^2+5x+6}-2/{x-3}=0` `e). 4/{2x^3+3x^2-8x-12}-1/{x^2-4}-4/{2x^2+7x+6}+1/{2x+3

`d). {13-x}/{x+3}+{6x^2+6}/{x^4-8x^2+9}-{3x+6}/{x^2+5x+6}-2/{x-3}=0`
`e). 4/{2x^3+3x^2-8x-12}-1/{x^2-4}-4/{2x^2+7x+6}+1/{2x+3}=0`