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(a-12)(a+2)-(a-3)(a-7)=45
We move all terms to the left:
(a-12)(a+2)-(a-3)(a-7)-(45)=0
We multiply parentheses ..
(+a^2+2a-12a-24)-(a-3)(a-7)-45=0
We get rid of parentheses
a^2+2a-12a-(a-3)(a-7)-24-45=0
We multiply parentheses ..
a^2-(+a^2-7a-3a+21)+2a-12a-24-45=0
We add all the numbers together, and all the variables
a^2-(+a^2-7a-3a+21)-10a-69=0
We get rid of parentheses
a^2-a^2+7a+3a-10a-21-69=0
We add all the numbers together, and all the variables
-90!=0
There is no solution for this equation
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