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(x-6)(2x+6)=2x^2-6x-36
We move all terms to the left:
(x-6)(2x+6)-(2x^2-6x-36)=0
We get rid of parentheses
-2x^2+(x-6)(2x+6)+6x+36=0
We multiply parentheses ..
-2x^2+(+2x^2+6x-12x-36)+6x+36=0
We get rid of parentheses
-2x^2+2x^2+6x-12x+6x-36+36=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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