21=6-1x-4x

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Solution for 21=6-1x-4x equation:


21=6-1x-4x

We simplify the equation to the form, which is simple to understand 
21=6-1x-4x

We move all terms containing x to the left and all other terms to the right. 
+1x+4x=+6-21

We simplify left and right side of the equation. 
+5x=-15

We divide both sides of the equation by 5 to get x. 
x=-3

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