3x=12+2x+9

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Solution for 3x=12+2x+9 equation: 



3x=12+2x+9

We move all terms to the left:

3x-(12+2x+9)=0

We add all the numbers together, and all the variables

3x-(2x+21)=0

We get rid of parentheses

3x-2x-21=0

We add all the numbers together, and all the variables

x-21=0

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

x=21

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