21=4-x

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Solution for 21=4-x equation: 



21=4-x

We move all terms to the left:

21-(4-x)=0

We add all the numbers together, and all the variables

-(-1x+4)+21=0

We get rid of parentheses

1x-4+21=0

We add all the numbers together, and all the variables

x+17=0

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

x=-17

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