63=72-x

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Solution for 63=72-x equation: 



63=72-x

We move all terms to the left:

63-(72-x)=0

We add all the numbers together, and all the variables

-(-1x+72)+63=0

We get rid of parentheses

1x-72+63=0

We add all the numbers together, and all the variables

x-9=0

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

x=9

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