-21=a-12

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Solution for -21=a-12 equation:


-21=a-12

We simplify the equation to the form, which is simple to understand 
-21=a-12

We move all terms containing a to the left and all other terms to the right. 
-1a=-12+21

We simplify left and right side of the equation. 
-1a=+9

We divide both sides of the equation by -01 to get a. 
a=-9

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