x+x=42

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Solution for x+x=42 equation:


x+x=42

We simplify the equation to the form, which is simple to understand 
x+x=42

We move all terms containing x to the left and all other terms to the right. 
+1x+1x=+42

We simplify left and right side of the equation. 
+2x=+42

We divide both sides of the equation by 2 to get x. 
x=21

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