2x+9=12+3x

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



2x+9=12+3x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

2x-3x-12+9=0

We add all the numbers together, and all the variables

-1x-3=0

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

-x=3

x=3/-1

x=-3

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