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(x+1)(x-2)(x+6)(x-3)=45x*x
We move all terms to the left:
(x+1)(x-2)(x+6)(x-3)-(45x*x)=0
We add all the numbers together, and all the variables
(x+1)(x-2)(x+6)(x-3)-(+45x*x)=0
We get rid of parentheses
(x+1)(x-2)(x+6)(x-3)-45x*x=0
We multiply parentheses ..
(+x^2-2x+x-2)(x+6)(x-3)-45x*x=0
Wy multiply elements
(+x^2-2x+x-2)(x+6)(x-3)-45x^2=0
We multiply parentheses ..
(+x^2-2x+x-2)(+x^2-3x+6x-18)-45x^2=0
We add all the numbers together, and all the variables
-45x^2+(+x^2-2x+x-2)(+x^2-3x+6x-18)=0
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