12x-6-12=21x+18

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Solution for 12x-6-12=21x+18 equation: 



12x-6-12=21x+18

We move all terms to the left:

12x-6-12-(21x+18)=0

We add all the numbers together, and all the variables

12x-(21x+18)-18=0

We get rid of parentheses

12x-21x-18-18=0

We add all the numbers together, and all the variables

-9x-36=0

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

-9x=36

x=36/-9

x=-4

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