2-x=-21

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Solution for 2-x=-21 equation: 



2-x=-21

We move all terms to the left:

2-x-(-21)=0

We add all the numbers together, and all the variables

-1x+23=0

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

-x=-23

x=-23/-1

x=+23

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