3=20+x

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Solution for 3=20+x equation: 



3=20+x

We move all terms to the left:

3-(20+x)=0

We add all the numbers together, and all the variables

-(x+20)+3=0

We get rid of parentheses

-x-20+3=0

We add all the numbers together, and all the variables

-1x-17=0

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

-x=17

x=17/-1

x=-17

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