30=12x-3x

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Solution for 30=12x-3x equation: 



30=12x-3x

We move all terms to the left:

30-(12x-3x)=0

We add all the numbers together, and all the variables

-(+9x)+30=0

We get rid of parentheses

-9x+30=0

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

-9x=-30

x=-30/-9

x=3+1/3

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