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(a-2)(a+18)=a2+a-36
We move all terms to the left:
(a-2)(a+18)-(a2+a-36)=0
We add all the numbers together, and all the variables
-(+a^2+a-36)+(a-2)(a+18)=0
We get rid of parentheses
-a^2-a+(a-2)(a+18)+36=0
We multiply parentheses ..
-a^2+(+a^2+18a-2a-36)-a+36=0
We add all the numbers together, and all the variables
-1a^2+(+a^2+18a-2a-36)-1a+36=0
We get rid of parentheses
-1a^2+a^2+18a-2a-1a-36+36=0
We add all the numbers together, and all the variables
15a=0
a=0/15
a=0
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