9=21-x

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Solution for 9=21-x equation:


9=21-x

We simplify the equation to the form, which is simple to understand 
9=21-x

We move all terms containing x to the left and all other terms to the right. 
+1x=+21-9

We simplify left and right side of the equation. 
+1x=+12

We divide both sides of the equation by 01 to get x. 
x=12

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