21=-2x+9

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Solution for 21=-2x+9 equation:


21=-2x+9

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

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

We simplify left and right side of the equation. 
+2x=-12

We divide both sides of the equation by 02 to get x. 
x=-6

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