123=x+42

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Solution for 123=x+42 equation: 



123=x+42

We move all terms to the left:

123-(x+42)=0

We get rid of parentheses

-x-42+123=0

We add all the numbers together, and all the variables

-1x+81=0

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

-x=-81

x=-81/-1

x=+81

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