7=55+x

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Solution for 7=55+x equation: 



7=55+x

We move all terms to the left:

7-(55+x)=0

We add all the numbers together, and all the variables

-(x+55)+7=0

We get rid of parentheses

-x-55+7=0

We add all the numbers together, and all the variables

-1x-48=0

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

-x=48

x=48/-1

x=-48

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