20-21=17+x

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Solution for 20-21=17+x equation: 



20-21=17+x

We move all terms to the left:

20-21-(17+x)=0

We add all the numbers together, and all the variables

-(x+17)+20-21=0

We add all the numbers together, and all the variables

-(x+17)-1=0

We get rid of parentheses

-x-17-1=0

We add all the numbers together, and all the variables

-1x-18=0

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

-x=18

x=18/-1

x=-18

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