21=4x-9-1x

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Solution for 21=4x-9-1x equation:


21=4x-9-1x

We simplify the equation to the form, which is simple to understand 
21=4x-9-1x

We move all terms containing x to the left and all other terms to the right. 
-4x+1x=-9-21

We simplify left and right side of the equation. 
-3x=-30

We divide both sides of the equation by -3 to get x. 
x=10

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