3=x-18

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Solution for 3=x-18 equation: 



3=x-18

We move all terms to the left:

3-(x-18)=0

We get rid of parentheses

-x+18+3=0

We add all the numbers together, and all the variables

-1x+21=0

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

-x=-21

x=-21/-1

x=+21

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