x+21=2x+4

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


x+21=2x+4

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

We move all terms containing x to the left and all other terms to the right. 
+1x-2x=+4-21

We simplify left and right side of the equation. 
-1x=-17

We divide both sides of the equation by -1 to get x. 
x=17

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