21x+42=42x-21

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Solution for 21x+42=42x-21 equation: 



21x+42=42x-21

We move all terms to the left:

21x+42-(42x-21)=0

We get rid of parentheses

21x-42x+21+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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