-x-12=-21

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Solution for -x-12=-21 equation: 



-x-12=-21

We move all terms to the left:

-x-12-(-21)=0

We add all the numbers together, and all the variables

-1x+9=0

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

-x=-9

x=-9/-1

x=+9

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