3x-9=12+6+3

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Solution for 3x-9=12+6+3 equation: 



3x-9=12+6+3

We move all terms to the left:

3x-9-(12+6+3)=0

We add all the numbers together, and all the variables

3x-9-21=0

We add all the numbers together, and all the variables

3x-30=0

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

3x=30

x=30/3

x=10

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