-21x+21=-21

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Solution for -21x+21=-21 equation: 



-21x+21=-21

We move all terms to the left:

-21x+21-(-21)=0

We add all the numbers together, and all the variables

-21x+42=0

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

-21x=-42

x=-42/-21

x=+2

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