21=-x-x+5

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Solution for 21=-x-x+5 equation:


21=-x-x+5

We simplify the equation to the form, which is simple to understand 
21=-x-x+5

We move all terms containing x to the left and all other terms to the right. 
+1x+1x=+5-21

We simplify left and right side of the equation. 
+2x=-16

We divide both sides of the equation by 2 to get x. 
x=-8

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