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(6x+1)(6x-1)(12x-1)(3x+1)=-18x^2
We move all terms to the left:
(6x+1)(6x-1)(12x-1)(3x+1)-(-18x^2)=0
We get rid of parentheses
18x^2+(6x+1)(6x-1)(12x-1)(3x+1)=0
We multiply parentheses ..
18x^2+(+36x^2-6x+6x-1)(12x-1)(3x+1)=0
We multiply parentheses ..
18x^2+(+36x^2-6x+6x-1)(+36x^2+12x-3x-1)=0
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