a(7-a)=12

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Solution for a(7-a)=12 equation: 



(7-A)=12

We move all terms to the left:

(7-A)-(12)=0

We add all the numbers together, and all the variables

(-1A+7)-12=0

We get rid of parentheses

-1A+7-12=0

We add all the numbers together, and all the variables

-1A-5=0

We move all terms containing A to the left, all other terms to the right

-A=5

A=5/-1

A=-5

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