2x-21=90+x

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Solution for 2x-21=90+x equation: 



2x-21=90+x

We move all terms to the left:

2x-21-(90+x)=0

We add all the numbers together, and all the variables

2x-(x+90)-21=0

We get rid of parentheses

2x-x-90-21=0

We add all the numbers together, and all the variables

x-111=0

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

x=111

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