12.9=-(-x)

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Solution for 12.9=-(-x) equation:


12.9=-(-x)

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

Remove unnecessary parentheses
12.9=+1x

We move all terms containing x to the left and all other terms to the right. 
-1x=-12.9

We simplify left and right side of the equation. 
-1x=-12.9

We divide both sides of the equation by -01 to get x. 
x=12.9

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