2x+x+x+9=3x+12

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



2x+x+x+9=3x+12

We move all terms to the left:

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

We add all the numbers together, and all the variables

4x-(3x+12)+9=0

We get rid of parentheses

4x-3x-12+9=0

We add all the numbers together, and all the variables

x-3=0

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

x=3

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