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(x+6)(x+12)-x(x+6)=252
We move all terms to the left:
(x+6)(x+12)-x(x+6)-(252)=0
We multiply parentheses
-x^2+(x+6)(x+12)-6x-252=0
We multiply parentheses ..
-x^2+(+x^2+12x+6x+72)-6x-252=0
We add all the numbers together, and all the variables
-1x^2+(+x^2+12x+6x+72)-6x-252=0
We get rid of parentheses
-1x^2+x^2+12x+6x-6x+72-252=0
We add all the numbers together, and all the variables
12x-180=0
We move all terms containing x to the left, all other terms to the right
12x=180
x=180/12
x=15
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