7=99+x

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Solution for 7=99+x equation: 



7=99+x

We move all terms to the left:

7-(99+x)=0

We add all the numbers together, and all the variables

-(x+99)+7=0

We get rid of parentheses

-x-99+7=0

We add all the numbers together, and all the variables

-1x-92=0

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

-x=92

x=92/-1

x=-92

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