123=200+x

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Solution for 123=200+x equation: 



123=200+x

We move all terms to the left:

123-(200+x)=0

We add all the numbers together, and all the variables

-(x+200)+123=0

We get rid of parentheses

-x-200+123=0

We add all the numbers together, and all the variables

-1x-77=0

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

-x=77

x=77/-1

x=-77

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