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(8-3d)(8-d)(8+d)(8+3d)=55
We move all terms to the left:
(8-3d)(8-d)(8+d)(8+3d)-(55)=0
We add all the numbers together, and all the variables
(-3d+8)(-1d+8)(d+8)(3d+8)-55=0
We multiply parentheses ..
(+3d^2-24d-8d+64)(d+8)(3d+8)-55=0
We multiply parentheses ..
(+3d^2-24d-8d+64)(+3d^2+8d+24d+64)-55=0
We move all terms containing d to the left, all other terms to the right
(+3d^2-24d-8d+64)(+3d^2+8d+24d+64)=55
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