9=-12-3x+4x

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Solution for 9=-12-3x+4x equation:


9=-12-3x+4x

We simplify the equation to the form, which is simple to understand 
9=-12-3x+4x

We move all terms containing x to the left and all other terms to the right. 
+3x-4x=-12-9

We simplify left and right side of the equation. 
-1x=-21

We divide both sides of the equation by -1 to get x. 
x=21

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