199=21-x

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Solution for 199=21-x equation: 



199=21-x

We move all terms to the left:

199-(21-x)=0

We add all the numbers together, and all the variables

-(-1x+21)+199=0

We get rid of parentheses

1x-21+199=0

We add all the numbers together, and all the variables

x+178=0

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

x=-178

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