10=9+x+21+(9+x)

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Solution for 10=9+x+21+(9+x) equation:


10=9+x+21+(9+x)

We simplify the equation to the form, which is simple to understand 
10=9+x+21+(9+x)

Remove unnecessary parentheses
+10=+9+x+21+9+x

We move all terms containing x to the left and all other terms to the right. 
-1x-1x=+9+21+9-10

We simplify left and right side of the equation. 
-2x=+29

We divide both sides of the equation by -2 to get x. 
x=-14.5

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