-3=x+100

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Solution for -3=x+100 equation: 



-3=x+100

We move all terms to the left:

-3-(x+100)=0

We get rid of parentheses

-x-100-3=0

We add all the numbers together, and all the variables

-1x-103=0

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

-x=103

x=103/-1

x=-103

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