21-x=2(x+6)

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



21-x=2(x+6)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(2(x+6)), so:

2(x+6)

We multiply parentheses

2x+12

Back to the equation:

-(2x+12)



We get rid of parentheses

-1x-2x-12+21=0

We add all the numbers together, and all the variables

-3x+9=0

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

-3x=-9

x=-9/-3

x=+3

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