6x-9=12x-21

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Solution for 6x-9=12x-21 equation: 



6x-9=12x-21

We move all terms to the left:

6x-9-(12x-21)=0

We get rid of parentheses

6x-12x+21-9=0

We add all the numbers together, and all the variables

-6x+12=0

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

-6x=-12

x=-12/-6

x=+2

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