17+20=21+x

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Solution for 17+20=21+x equation: 



17+20=21+x

We move all terms to the left:

17+20-(21+x)=0

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

-(x+21)+37=0

We get rid of parentheses

-x-21+37=0

We add all the numbers together, and all the variables

-1x+16=0

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

-x=-16

x=-16/-1

x=+16

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