12x-21=9x+78

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Solution for 12x-21=9x+78 equation: 



12x-21=9x+78

We move all terms to the left:

12x-21-(9x+78)=0

We get rid of parentheses

12x-9x-78-21=0

We add all the numbers together, and all the variables

3x-99=0

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

3x=99

x=99/3

x=33

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