210=21-x

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Solution for 210=21-x equation: 



210=21-x

We move all terms to the left:

210-(21-x)=0

We add all the numbers together, and all the variables

-(-1x+21)+210=0

We get rid of parentheses

1x-21+210=0

We add all the numbers together, and all the variables

x+189=0

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

x=-189

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