3x-9=12+5x

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Solution for 3x-9=12+5x equation: 



3x-9=12+5x

We move all terms to the left:

3x-9-(12+5x)=0

We add all the numbers together, and all the variables

3x-(5x+12)-9=0

We get rid of parentheses

3x-5x-12-9=0

We add all the numbers together, and all the variables

-2x-21=0

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

-2x=21

x=21/-2

x=-10+1/2

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