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(6+x)(6+x)-(36x)(36x)=0
We add all the numbers together, and all the variables
(x+6)(x+6)-36x36x=0
We multiply parentheses ..
(+x^2+6x+6x+36)-36x36x=0
We get rid of parentheses
x^2+6x+6x-36x36x+36=0
We add all the numbers together, and all the variables
x^2+12x-36x36x+36=0
We move all terms containing x to the left, all other terms to the right
x^2+12x-36x36x=-36
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