21=5+x+x-2

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Solution for 21=5+x+x-2 equation: 



21=5+x+x-2

We move all terms to the left:

21-(5+x+x-2)=0

We add all the numbers together, and all the variables

-(2x+3)+21=0

We get rid of parentheses

-2x-3+21=0

We add all the numbers together, and all the variables

-2x+18=0

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

-2x=-18

x=-18/-2

x=+9

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