-x=21-12

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Solution for -x=21-12 equation: 



-x=21-12

We move all terms to the left:

-x-(21-12)=0

We add all the numbers together, and all the variables

-x-9=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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