21-21x=-42

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Solution for 21-21x=-42 equation: 



21-21x=-42

We move all terms to the left:

21-21x-(-42)=0

We add all the numbers together, and all the variables

-21x+63=0

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

-21x=-63

x=-63/-21

x=+3

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