21-x=4x

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Solution for 21-x=4x equation: 



21-x=4x

We move all terms to the left:

21-x-(4x)=0

We add all the numbers together, and all the variables

-5x+21=0

We move all terms containing x to the left, all other terms to the right

-5x=-21

x=-21/-5

x=4+1/5

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