21=(2x+4)

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Solution for 21=(2x+4) equation:


21=(2x+4)

We simplify the equation to the form, which is simple to understand 
21=(2x+4)

Remove unnecessary parentheses
21=2x+4

We move all terms containing x to the left and all other terms to the right. 
-2x=+4-21

We simplify left and right side of the equation. 
-2x=-17

We divide both sides of the equation by -02 to get x. 
x=8.5

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