x+x+7=21

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Solution for x+x+7=21 equation:


x+x+7=21

We simplify the equation to the form, which is simple to understand 
x+x+7=21

We move all terms containing x to the left and all other terms to the right. 
+1x+1x=+21-7

We simplify left and right side of the equation. 
+2x=+14

We divide both sides of the equation by 2 to get x. 
x=7

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