6-x=-21

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Solution for 6-x=-21 equation: 



6-x=-21

We move all terms to the left:

6-x-(-21)=0

We add all the numbers together, and all the variables

-1x+27=0

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

-x=-27

x=-27/-1

x=+27

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