-10-x=21

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Solution for -10-x=21 equation: 



-10-x=21

We move all terms to the left:

-10-x-(21)=0

We add all the numbers together, and all the variables

-1x-31=0

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

-x=31

x=31/-1

x=-31

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