21=12+2x

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Solution for 21=12+2x equation: 



21=12+2x

We move all terms to the left:

21-(12+2x)=0

We add all the numbers together, and all the variables

-(2x+12)+21=0

We get rid of parentheses

-2x-12+21=0

We add all the numbers together, and all the variables

-2x+9=0

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

-2x=-9

x=-9/-2

x=4+1/2

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