21-x=6+2x

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Solution for 21-x=6+2x equation: 



21-x=6+2x

We move all terms to the left:

21-x-(6+2x)=0

We add all the numbers together, and all the variables

-x-(2x+6)+21=0

We add all the numbers together, and all the variables

-1x-(2x+6)+21=0

We get rid of parentheses

-1x-2x-6+21=0

We add all the numbers together, and all the variables

-3x+15=0

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

-3x=-15

x=-15/-3

x=+5

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