12x-9=7x+21

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Solution for 12x-9=7x+21 equation: 



12x-9=7x+21

We move all terms to the left:

12x-9-(7x+21)=0

We get rid of parentheses

12x-7x-21-9=0

We add all the numbers together, and all the variables

5x-30=0

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

5x=30

x=30/5

x=6

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