21=x+2x+12

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Solution for 21=x+2x+12 equation: 



21=x+2x+12

We move all terms to the left:

21-(x+2x+12)=0

We add all the numbers together, and all the variables

-(3x+12)+21=0

We get rid of parentheses

-3x-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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