7=x-42

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Solution for 7=x-42 equation: 



7=x-42

We move all terms to the left:

7-(x-42)=0

We get rid of parentheses

-x+42+7=0

We add all the numbers together, and all the variables

-1x+49=0

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

-x=-49

x=-49/-1

x=+49

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