63-21x=21x-63

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Solution for 63-21x=21x-63 equation: 



63-21x=21x-63

We move all terms to the left:

63-21x-(21x-63)=0

We get rid of parentheses

-21x-21x+63+63=0

We add all the numbers together, and all the variables

-42x+126=0

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

-42x=-126

x=-126/-42

x=+3

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