30-9x=12x+9

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Solution for 30-9x=12x+9 equation: 



30-9x=12x+9

We move all terms to the left:

30-9x-(12x+9)=0

We get rid of parentheses

-9x-12x-9+30=0

We add all the numbers together, and all the variables

-21x+21=0

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

-21x=-21

x=-21/-21

x=1

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