(12-21)=x

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Solution for (12-21)=x equation:


(12-21)=x

We simplify the equation to the form, which is simple to understand 
(12-21)=x

Simplifying terms in parentheses
(-9)=x

Remove unnecessary parentheses
-9=x

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

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

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

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