21=7+4x

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Solution for 21=7+4x equation:


21=7+4x

We simplify the equation to the form, which is simple to understand 
21=7+4x

We move all terms containing x to the left and all other terms to the right. 
-4x=+7-21

We simplify left and right side of the equation. 
-4x=-14

We divide both sides of the equation by -04 to get x. 
x=3.5

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