30=7-x

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Solution for 30=7-x equation: 



30=7-x

We move all terms to the left:

30-(7-x)=0

We add all the numbers together, and all the variables

-(-1x+7)+30=0

We get rid of parentheses

1x-7+30=0

We add all the numbers together, and all the variables

x+23=0

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

x=-23

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