7x-21=

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Solution for 7x-21= equation:


7x-21=0

We simplify the equation to the form, which is simple to understand 
7x-21=0

We move all terms containing x to the left and all other terms to the right. 
+7x=0+21

We simplify left and right side of the equation. 
+7x=+21

We divide both sides of the equation by 7 to get x. 
x=3

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