21=-x+2+9

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Solution for 21=-x+2+9 equation:


21=-x+2+9

We simplify the equation to the form, which is simple to understand 
21=-x+2+9

We move all terms containing x to the left and all other terms to the right. 
+1x=+2+9-21

We simplify left and right side of the equation. 
+1x=-10

We divide both sides of the equation by 01 to get x. 
x=-10

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