21=4-2x

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Solution for 21=4-2x equation:


21=4-2x

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

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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