12x=3x+9x

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



12x=3x+9x

We move all terms to the left:

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

We add all the numbers together, and all the variables

12x-(+12x)=0

We get rid of parentheses

12x-12x=0

We add all the numbers together, and all the variables

=0

x=0/1

x=0

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