9-a=12

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Solution for 9-a=12 equation:


9-a=12

We simplify the equation to the form, which is simple to understand 
9-a=12

We move all terms containing a to the left and all other terms to the right. 
-1a=+12-9

We simplify left and right side of the equation. 
-1a=+3

We divide both sides of the equation by -1 to get a. 
a=-3

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